Checklist of lichens of Alaska (USA)
Preliminary version 1 December 2016

  1. Acarospora badiofusca (Nyl.) Th. Fr. - Thomson (1997: 21)
  2. Acarospora fuscata (Nyl.) Arnold - Thomson (1997: 24)
  3. Acarospora glaucocarpa (Wahlenb.) Körb. - Thomson (1997: 25)
  4. Acarospora schleicheri (Ach.) A. Massal. - Thomson (1997: 33)
  5. Acarospora sinopica (Wahlenb.) Körb. - Spribille et al. (2010: 467)
  6. Acarospora veronensis A. Massal. - Thomson (1997: 35), Flock (2011: 16)

  7. Adelolecia pilati (Hepp) Hertel & Hafellner - Thomson (1997: 37), Spribille et al. (2010: 467)

  8. Agonimia tristicula (Nyl.) Zahlbr. - Spribille et al. (2010: 467)

  9. Ahtiana pallidula (Tuck. ex Riddle) Goward & A. Thell - Howe (1911: xx erroneously as Cetraria oakesiana fide Spribille et al.), Riddle (1915: xx), Spribille et al. (2010: 467)

  10. Alectoria nigricans (Ach.) Nyl. - Howard (1958: 87), Thomson (1984: 35), Geiser et al. (1998: 209), Flock (2011: 16)
  11. Alectoria ochroleuca (Hoffm.) A. Massal. - Howard (1958: 87), Thomson (1984: 37), Geiser et al. (1998: 209), Flock (2011: 16)
  12. Alectoria sarmentosa (Ach.) Ach. - Geiser et al. (1998: 209)
  13. Alectoria vexillifera (Nyl.) Stizenb. - Geiser et al. (1998: 209 as Alectoria sarmentosa subsp. vexillifera)

  14. Allantoparmelia almquistii (Vain.) Essl. - Thomson (1984: 297 sub Parmelia almquistii), Geiser et al. (1998: 209)
  15. Allantoparmelia alpicola Th. Fr. - Thomson (1984: 299 sub Parmelia alpicola), Geiser et al. (1998: 209), Flock (2011: 16)

  16. Allocetraria madreporiformis (Ach.) Kärnefelt & A. Thell - Thomson (1984: 206 as Dactylina madreporiformis)

  17. Amandinea coniops (Wahlenb. in Ach.) M. Choisy ex Scheid. & H. Mayrhofer - Thomson (1997: 128 as Buellia coniops), Geiser et al. (1998: 209)
    x
  18. Amandinea polyspora (Willey in Tuck.) Vain. - Thomson (1997: 137 as Buellia polyspora)
  19. Amandinea punctata (Hoffm.) Coppins & Scheid. - Thomson (1997: 138 as Buellia punctata), Geiser et al. (1998: 209), Flock (2011: 16)

  20. Amygdalaria consentiens (Nyl.) Hertel, Brodo & M. Inoue - Geiser et al. (1998: 209)
  21. Amygdalaria continua Brodo & Hertel - Geiser et al. (1998: 209)
  22. Amygdalaria elegantior (H. Magn.) Hertel & Brodo - Thomson (1997: 41), Geiser et al. (1998: 209)
  23. Amygdalaria haidensis Brodo & Hertel - Geiser et al. (1998: 209)
  24. Amygdalaria paneola (Ach.) Hertel & Brodo - Thomson (1997: 42), Geiser et al. (1998: 209), Flock (2011: 16)
  25. Amygdalaria pelobotryon (Wahlenb. in Ach.) Norman - Thomson (1997: 43), Geiser et al. (1998: 209), Flock (2011: 16)
  26. Amygdalaria subdissentiens (Nyl.) M. Inoue & Brodo - Geiser et al. (1998: 209)

  27. Anaptychia crinalis (Schaer.) Vezda - Thomson (1984: 40 erroneously as Anaptychia kaspica)

  28. Arctocetraria andrejevii (Oxner) Kärnefelt - Thomson (1984: 72 as Cetraria andrejevii), Flock (2011: 16)

  29. Arctomia delicatula Th. Fr. - Geiser et al. (1998: 209)

  30. Arctoparmelia centrifuga (L.) Hale - Howard (1958: 90 sub Parmelia centrifuga), Thomson (1984: 476 as Xanthoparmelia centrifuga), Flock (2011: 16)
  31. Arctoparmelia incurva (Pers.) Hale - Thomson (1984: 478 as Xanthoparmelia incurva), Geiser et al. (1998: 209)
  32. Arctoparmelia separata (Th. Fr.) Hale - Thomson (1984: 479 as Xanthoparmelia separata), Geiser et al. (1998: 209)

    x

  33. Arthonia mediella Nyl. - Thomson (1997: 47)
    x
  34. Arthonia phaeobaea (Norman) Norman - Geiser et al. (1998: 209)
    x
  35. Arthonia punctiformis Ach. - Geiser et al. (1998: 209)

    x

  36. Arthrorhaphis alpina (Schaer.) Sant. - Thomson (1997: 50)
    x
  37. Arthrorhaphis citrinella (Ach.) Poelt - Geiser et al. (1998: 210)

    x

  38. Asahinea chrysantha (Tuck.) W. L. Culb. & C. F. Culb. - Thomson (1984: 44), Geiser et al. (1998: 210), Flock (2011: 16)
    x
  39. Asahinea scholanderi (Llano) W. L. Culb. & C. F. Culb. - Llano (1951: 197 as Cetraria scholanderi Type in Washington, USA US), Thomson (1984: 45)

    x

  40. Aspicilia aliena (Zahlbr.) Oxner - Thomson (1997: 58)
    x
  41. Aspicilia annulata (Lynge) J. W. Thomson - Thomson (1997: 60)
    x
  42. Aspicilia anseris (Lynge) J. W. Thomson - Thomson (1997: 61)
    x
  43. Aspicilia aquatica Körb. - Thomson (1997: 62)
    x
  44. Aspicilia candida (Anzi) Hue - Thomson (1997: 67)
    x
  45. Aspicilia cinerea (L.) Körb. - Thomson (1997: 68)
    x
  46. Aspicilia cingulata (Zahlbr.) Oxner - Thomson (1997: 70)
    x
  47. Aspicilia concinna (J. W. Thomson) J. W. Thomson - Thomson (1972: xx as Lecanora concinna [as 'concinnum'] Type), Thomson (1997: 72)
    x
  48. Aspicilia contigua (Lynge) J. W. Thomson - Thomson (1997: 72)
    x
  49. Aspicilia disserpens (Zahlbr.) Räsänen - Thomson (1997: 74), Flock (2011: 17)
    x
  50. Aspicilia elevata (Lynge) J. W. Thomsen - Thomson (1997: 75)
    x
  51. Aspicilia fimbriata (H. Magn.) Clauz. & Rondon - Thomson (1997: 76)
    x
  52. Aspicilia heteroplaca (Zahlbr.) Oxner - Thomson (1997: 78)
    x
  53. Aspicilia lesleyana Darbish. - Thomson (1997: 79)
    x
  54. Aspicilia pergibbosa (H. Magn.) Räsänen - Thomson (1997: 87)
    x
  55. Aspicilia perradiata (Nyl.) Hue - Thomson (1997: 88)
    x
  56. Aspicilia plicigera (Zahlbr.) Räsänen - Thomson (1997: 90 )
    x
  57. Aspicilia rosulata Körb. - Thomson (1997: 90)
    x
  58. Aspicilia ryrkaipiae (H. Magn.) Oxner - Thomson (1997: 92)
    x
  59. Aspicilia subradians (Nyl.) Hue - Thomson (1997: 94)
    x
  60. Aspicilia supertegens Arnold - Thomson (1997: 95)

    x

  61. Aspilidea myrinii (Fr. in Myrin) Hafellner - Thomson (1997: 85 as Aspicilia myrinii)

    x

  62. Athallia holocarpa (Hoffm.) xxx - Thomson (1997: 164 as Caloplaca holocarpa), Geiser et al. (1998: 212 as Caloplaca holocarpa), Flock (2011: 17 as Caloplaca holocarpa)
    x
  63. Athallia vitellinula (Nyl.) xxx - Flock (2011: 17 as Caloplaca vitellinula)

    x

  64. Bacidia bagliettoana (A. Massal. & De Not. in A. Massal.) Jatta - Thomson (1997: 99), Flock (2011: 17)
    x
  65. Bacidia beckhausii Körb. - Thomson (1997: 100), Geiser et al. (1998: 210)
    x
  66. Bacidia rubella (Hoffm.) A. Massal. - Thomson (1997: 107)
    x
  67. Bacidia subincompta (Nyl.) Arnold - Thomson (1997: 110)

    x

  68. Bactrosporum cascadensis Ponzetti & McCune - McCune & Ponzetti (2011: 2)

    x

  69. Baeomyces carneus (Retz.) Flörke - Thomson (1984: 48)
    x
  70. Baeomyces placophyllus Ach. - Thomson (1984: 49), Geiser et al. (1998: 210), Flock (2011: 17)
    x
  71. Baeomyces rufus (Huds.) Rebent. - Thomson (1984: 52), Geiser et al. (1998: 210)

    x

  72. Bellemerea alpina (Sommerf.) Clauz. & Roux - Thomson (1997: 115)
    x
  73. Bellemerea cinereorufescens (Ach.) Clauz. & Roux - Thomson (1997: 116), Geiser et al. (1998: 210)
    x
  74. Bellemerea subsorediza (Lynge in Dahl, Lynge & Schol.) Sant. - Thomson (1997: 117)

    x

  75. Biatora aegrefaciens Printzen - Printzen et al. (2002: 38)
    x
  76. Biatora cuprea (Sommerf.) Fr. - Geiser et al. (1998: 210)
    x
  77. Biatora ligni-mollis T. Sprib. & Printzen - Thomson (1997: 325 as Lecidea albohyalina)
    x
  78. Biatora subduplex (Nyl.) Printzen - Flock (2011: 17)
    x
  79. Biatora vernalis (L.) Fr. - Geiser et al. (1998: 210)

    x

  80. Biatorella hemisphaerica Anzi - Thomson (1997: 119)

    x

  81. Bilimbia lobulata (Sommerf.) xxx - Flock (2011: 22 as Mycobilimbia lobulata)
    x
  82. Bilimbia sabuletorum (Schreb.) xxx - Thomson (1997: 422 as Mycobilimbia sabuletorum), Flock (2011: 22 as Mycobilimbia sabuletorum)
    x
  83. Blastenia ammiospila (Ach.) xxx - Thomson (1997: 151 as Caloplaca ammiospila), Flock (2011: 17 as Caloplaca ammiospila)
    x
  84. Blastenia ferruginea (Huds.) xxx - Geiser et al. (1998: 212 as Caloplaca ferruginea)

    x

  85. Blennothallia crispum (Huds.) xxx - Thomson (1984: 183 as Collema crispum)

    x

  86. Brigantiaea fuscolutea (Dickson) R. Sant. - Thomson (1997: 120), Geiser et al. (1998: 210)

    x

  87. Brodoa oroarctica (Krog) Goward - Thomson (1984: 239 as Hypogymnia oroarctica), Geiser et al. (1998: 210), Flock (2011: 17)

    x

  88. Bryobilimbia hypnorum (Lib.) Fryday, Printzen & S. Ekman - Thomson (1997: 351 as Lecidea hypnorum)

    x

  89. Bryocaulon divergens (Ach.) Kärnefelt - Howard (1958: 89 as Cornicularia divergens), Thomson (1984: 199 as Cornicularia divergens), Geiser et al. (1998: 210), Flock (2011: 17)
    x
  90. Bryocaulon pseudosatoanum (Asah.) Kärnefelt - Geiser et al. (1998: 210)

    x

  91. Bryonora castanea (Hepp) Poelt - Thomson (1997: 122)
    x
  92. Bryonora curvescens (Mudd) Poelt - Thomson (1997: 122)

    x

  93. Bryoplaca jungermanniae (Vahl) xxx - Thomson (1997: 166 as Caloplaca jungermanniae)
    x
  94. Bryoplaca tetraspora (Nyl.) Oliv. - Thomson (1997: 172 as Caloplaca tetraspora), Flock (2011: 17 as Caloplaca tetraspora)
    x
  95. Bryoria bicolor (Ehrh.) Brodo & D. Hawksw. - Geiser et al. (1998: 210)
    x
  96. Bryoria capillaris (Ach.) Brodo & D. Hawksw. - Thomson (1984: 55), Geiser et al. (1998: 210)
    x
  97. Bryoria carlottae Brodo & D. Hawksw. - Geiser et al. (1998: 210)
    x
  98. Bryoria cervinula Motyka ex Brodo & D. Hawksw. - Geiser et al. (1998: 210)
    x
  99. Bryoria chalybeiformis (L.) Brodo & D. Hawksw. - Thomson (1984: 56), Geiser et al. (1998: 211), Flock (2011: 17)
    x
  100. Bryoria friabilis Brodo & D. Hawksw. - Geiser et al. (1998: 211)
    x
  101. Bryoria fuscescens (Gyeln.) Brodo & D. Hawksw. - Howard (1958: 87 sub Alectoria jubata), Thomson (1984: 57), Geiser et al. (1998: 211)
    x
  102. Bryoria glabra (Motyka) Brodo & D. Hawksw. - Thomson (1984: 58), Geiser et al. (1998: 211)
    x
  103. Bryoria lanestris (Ach.) Brodo & D. Hawksw. - Thomson (1984: 59), Geiser et al. (1998: 211)
    x
  104. Bryoria nadvornikiana (Gyeln.) Brodo & D. Hawksw. - Thomson (1984: 61), Geiser et al. (1998: 211)
    x
  105. Bryoria nitidula (Th. Fr.) Brodo & D. Hawksw. - Thomson (1984: 63), Geiser et al. (1998: 211)
    x
  106. Bryoria pseudofuscescens (Gyeln.) Brodo & D. Hawksw. - Thomson (1984: 63), Geiser et al. (1998: 211)
    x
  107. Bryoria simplicior (Vain.) Brodo & D. Hawksw. - Thomson (1984: 65)
    x
  108. Bryoria subcana (Nyl. ex Stizenb.) Brodo & D. Hawksw. - Geiser et al. (1998: 211)
    x
  109. Bryoria tenuis (E. Dahl) Brodo & D. Hawksw. - Thomson (1984: 66), Geiser et al. (1998: 211)
    x
  110. Bryoria trichodes (Michx.) Brodo & D. Hawksw. subsp. trichodes - Thomson (1984: 68), Geiser et al. (1998: 211)

    x

  111. Buellia aethalea (Ach.) Th. Fr. - Thomson (1997: 125)
    x
  112. Buellia disciformis (Fr.) Mudd - Thomson (1997: 129), Flock (2011: 17)
    x
  113. Buellia elegans Poelt - Thomson (1997: 130)
    x
  114. Buellia erubescens Arnold - Thomson (1997: 131), Geiser et al. (1998: 211)
    x
  115. Buellia spuria (Schaer.) Anzi - Geiser et al. (1998: 211)
    x
  116. Buellia stigmatea Körb. - Thomson (1997: 140)
    x
  117. Buellia vilis Th. Fr. - Thomson (1997: 141)

    x

  118. Bunodophoron melanocarpum A. Massal. - Geiser et al. (1998: 211)

    x

  119. Caeruleum heppii (Nägeli ex Körb.) K. Knudsen & B. Abbott - Thomson (1997: 28 as Acarospora heppii)

    x

  120. Calicium adaequatum Nyl. - Geiser et al. (1998: 211)
    x
  121. Calicium lenticulare Ach. - Geiser et al. (1998: 212)
    x
  122. Calicium viride Pers. - Geiser et al. (1998: 212)

    x

  123. Callome multipartita (Sm.) xxx - Thomson (1984: 189 as Collema multipartitum)

    x

  124. Caloplaca atrosanguinea (G. K. Merr.) I. M. Lamb - Geiser et al. (1998: 212)
    x
  125. Caloplaca cerina (Ehrh. ex Hedwig) Th. Fr. - Thomson (1997: 154), Flock (2011: 17)
    x
  126. Caloplaca exsecuta (Nyl.) Dalla Torre & Sarnth. - Thomson (1997: 160)
    x
  127. Caloplaca fraudans (Th. Fr.) Oliv. - Thomson (1997: 162)
    x
  128. Caloplaca litoricola Brodo - Geiser et al. (1998: 212)
    x
  129. Caloplaca phaeocarpella (Nyl.) Zahlb. - Thomson (1997: 168)
    x
  130. Caloplaca pollinii (A. Massal.) Jatta - Geiser et al. (1998: 212)
    x
  131. Caloplaca saxicola (Hoffm.) Nordin - Thomson (1997: 169)
    x
  132. Caloplaca stillicidiorum (Vahl) Lynge - Thomson (1997: 172)
    x
  133. Caloplaca tornoensis H. Magn. - Thomson (1997: 175)

    x

  134. Calvitimela aglaea (Sommerf.) xxx - Thomson (1997: 600 as Tephromela aglaea)
    x
  135. Calvitimela armeniaca (DC. in Lam. & DC.) xxx - Thomson (1997: 60 as Tephromela armeniaca)

    x

  136. Candelaria concolor (Dicks.) Stein - Geiser et al. (1998: 212)

    x

  137. Candelariella arctica (Körb.) R. Sant. - Thomson (1997: 180)
    x
  138. Candelariella aurella (Hoffm.) Zahlbr. - Thomson (1997: 182), Geiser et al. (1998: 212), Flock (2011: 17)
    x
  139. Candelariella canadensis H. Magn. - Geiser et al. (1998: 212)
    x
  140. Candelariella citrina xxx - Thomson (1997: 187 as Candelariella terrigena)
    x
  141. Candelariella lutella (Vain.) Räsänen - Thomson (1997: 185)
    x
  142. Candelariella placodizans (Nyl.) H. Magn. - Thomson (1997: 186)
    x
  143. Candelariella vitellina (Hoffm.) Müll. Arg. - Thomson (1997: 189), Flock (2011: 18)
    x
  144. Candelariella xanthostigma (Ach.) Lettau - Thomson (1997: 190)

    x

  145. Carbonea vitellinaria (Nyl.) Hertel - Thomson (1997: 192)
    x
  146. Carbonea vorticosa (Flörke) Hertel - Thomson (1997: 193), Geiser et al. (1998: 212)

    x

  147. Catapyrenium cinereum (Pers.) xxx - Thomson (1984: 211 as Dermatocarpon cinereum)

    x

  148. Catillaria chalybeia (Borrer) A. Massal. - Thomson (1997: 196)
    x
  149. Catillaria muscicola Lynge - Thomson (1997: 198)
    x
  150. Catillaria subnegans (Nyl.) Boistel - Thomson (1997: 200)

    x

  151. Catolechia wahlenbergii (Ach.) Körb. - Thomson (1997: 202)

    x

  152. Cetraria aculeata (Schreb.) Fr. - Thomson (1984: 198 sub Cornicularia aculeata), Thomson (1984: 200 sub Cornicularia muricata), Geiser et al. (1998: 212)
    x
  153. Cetraria ericetorum Opiz - Howard (1958: 87 as Cetraria tenuifolia), Thomson (1984: 79), Geiser et al. (1998: 212), Flock (2011: 18)
    x
  154. Cetraria islandica (L.) Ach. subsp. islandica - Howard (1958: 87), Thomson (1984: 84), Geiser et al. (1998: 212 inclusive subsp. crispiformis and subsp. orientalis), Flock (2011: 18)
  155. Cetraria kamczatica Savicz - Thomson (1984: 86), Flock (2011: 18)
    x
  156. Cetraria laevigata Rass. - Thomson (1984: 88), Flock (2011: 18)
    x
  157. Cetraria muricata (Ach.) Eckfeldt - Geiser et al. (1998: 212)
    x
  158. Cetraria nigricans (Retz.) Nyl. in Esslinger nur Nyl. - Thomson (1984: 89), Flock (2011: 18)
    x
  159. Arctocetraria nigricascens (Nyl. in Kihlm.) xxx - Thomson (1984: 90 as Cetraria nigricascens)
    x
  160. Tuckermannopsis sepincola (Ehrh.) xxx - Thomson (1984: 94 as Cetraria sepincola)

    x

  161. Cetrariella commixta (Nyl.) A. Thell & Kärnefelt - Thomson (1984: 75 as Cetraria commixta), Flock (2011: 18 as Cetraria commixta)
    x
  162. Cetrariella delisei xxx - Thomson (1984: 77 as Cetraria delisei), Flock (2011: 18 as Cetrariella delisei)
    x
  163. Cetrariella fastigiata xxx - Thomson (1984: 80 as Cetraria fastigiata), Flock (2011: 18)

    x

  164. Cetrelia alaskana (C. F. Culb. & W. L. Culb.) W. L. Culb. & C. L. Culb. - Thomson (1984: 97), Flock (2011: 18)

    x

  165. Chaenotheca furfuracea (L.) xxx - Thomson (1997: 210 as Coniocybe furfuracea)

    x

  166. Circinaria caesiocinerea (Nyl. ex Malbr.) A. Nordin, Savić & Tibell - Thomson (1997: 65 as Aspicilia caesiocinerea)
    x
  167. Circinaria gibbosa (Ach.) A. Nordin, S. Savić & Tibell - Geiser et al. (1998: 210 as Aspicilia gibbosa)

    x

  168. Cladonia acuminata ( Ach.) Norrl. - Thomson (1984: 105), Thomson (1984: 152 as Cladonia norrlinii)
    x
  169. Cladonia alaskana Evans - Evans (1947: 35 Type in Washington, USA US), Thomson (1984: 106)
    x
  170. Cladonia amaurocraea (Flörke) Schaer. - Thomson (1984: 107), Flock (2011: 18)
    x
  171. Cladonia arbuscula (Wallr.) Rabenh. subsp. arbuscula - Howard (1958: 89 as Cladonia sylvatica)Thomson (1984: 110)
    x
  172. Cladonia arbuscula (Wallr.) Rabenh. subsp. beringiana Ahti - Flock (2011: 18)
    x
  173. Cladonia bacillaris (Ach.) Nyl. - Thomson (1984: 111)
    x
  174. Cladonia bacilliformis (Nyl.) xxx - Thomson (1984: 112)
    x
  175. Cladonia bellidiflora (Ach.) Schaer. - Howard (1958: 88), Thomson (1984: 113), Flock (2011: 18)
    x
  176. Cladonia botrytes xxx - Thomson (1984: 114)
    x
  177. Cladonia cariosa (Ach.) Spreng. - Thomson (1984: 116), Flock (2011: 18)
    x
  178. Cladonia carneola (Fr.) Fr. - Thomson (1984: 117)
    x
  179. Cladonia cenotea (Ach.) Schaer. - Howard (1958: 88), Thomson (1984: 118)
    x
  180. Cladonia chlorophaea (Flörke ex. Sommerf.) Spreng. - Howard (1958: 88), Thomson (1984: 119)
    x
  181. Cladonia coccifera (L.) Willd. - Howard (1958: 88), Thomson (1984: 121), Flock (2011: 19)
    x
  182. Cladonia coniocraea (Flörke) Spreng. - Thomson (1984: 122)
    x
  183. Cladonia cornuta (L.) Hoffm. - Thomson (1984: 124)
    x
  184. Cladonia crispata (Ach.) Flot. - Thomson (1984: 125), Flock (2011: 19)
    x
  185. Cladonia cryptochlorophaea Asah. - Thomson (1984: 126)
    x
  186. Cladonia cyanipes (Somm.) Nyl. - Thomson (1984: 127)
    x
  187. Cladonia decorticata (Flörke) Spreng. - Thomson (1984: 128), Flock (2011: 19)
    x
  188. Cladonia deformis (L.) Hoffm. - Howard (1958: 88), Thomson (1984: 129), Flock (2011: 19)
    x
  189. Cladonia digitata (L.) Hoffm. - Thomson (1984: 131)
    x
  190. Cladonia ecmocyna Leight. - Thomson (1984: 132), Flock (2011: 19)
    x
  191. Cladonia fimbriata (L.) Fr. - Thomson (1984: 133), Thomson (1984: 144 as Cladonia major)
    x
  192. Cladonia glauca Flörke - Thomson (1984: 135)
    x
  193. Cladonia gracilis (L.) Willd. subsp. turbinata (Ach.) Ahti - Thomson (1984: 136)
    x
  194. Cladonia gracilis (L.) Willd. subsp. gracilis - Thomson (1984: 137 as Cladonia gracilis var. gracilis), Flock (2011: 19 as Cladonia gracilis var. gracilis)
    x
  195. Cladonia gracilis (L.) Willd. subsp. vulnerata Ahti - Ahti (1980: 207 Type in Helsinki, Finland H), Ahti (1993: 79)
    x
  196. Cladonia granulans Vain. - Thomson (1984: 139)
    x
  197. Cladonia grayi xxx - Thomson (1984: 139)
    x
  198. Cladonia humilis (With.) J. R. Laundon - Thomson (1984: 123 as Cladonia conista)
    x
  199. Cladonia kanewskii Oxner - Thomson (1984: 140)
    x
  200. Cladonia macrophylla (Schaer.) Stenham. - Thomson (1984: 141)
    x
  201. Cladonia macrophyllodes Nyl. - Thomson (1984: 143)
    x
  202. Cladonia maxima (Asah.) Ahti - Thomson (1984: 145), Flock (2011: 19)
    x
  203. Cladonia merochlorophaea Asah. - Thomson (1984: 143)
    x
  204. Cladonia mitis Sandst. - Howard (1958: 89), Thomson (1984: 148), Flock (2011: 19)
    x
  205. Cladonia multiformis Merr. - Thomson (1984: 149)
    x
  206. Cladonia nipponica Asah. - Thomson (1984: 150)
    x
  207. Cladonia phyllophora Ehrh. ex Hoffm. - Thomson (1984: 153)
    x
  208. Cladonia pleurota (Flörke) Schaer. - Howard (1958: 89), Thomson (1984: 154), Flock (2011: 19)
    x
  209. Cladonia pocillum (Ach.) xxx - Howard (1958: 89 as Cladonia pyxidata var. pocillum), Thomson (1984: 156)
    x
  210. Cladonia pseudostellata Asah. - Thomson (1984: 157)
    x
  211. Cladonia pyxidata (L.) Hoffm. - Thomson (1984: 158)
    x
  212. Cladonia ramulosa (Ach.) Ahti & P. James - Thomson (1984: 109 as Cladonia anomaea)
    x
  213. Cladonia rangiferina (L.) Wigg. - Howard (1958: 89), Thomson (1984: 159), Flock (2011: 19)
    x
  214. Cladonia scabriuscula (Del. in Duby) Nyl. - Thomson (1984: 160)
    x
  215. Cladonia squamosa (Scop.) Hoffm. - Howard (1958: 89), Thomson (1984: 161)
    x
  216. Cladonia stellaris (Opiz) Pouzar & Vezda - Howard (1958: 88 as Cladonia alpestris), Thomson (1984: 104 as Cladonia aberrans), Thomson (1984: 163), Flock (2011: 19)
    x
  217. Cladonia straminea xxx - Thomson (1984: 147 as Cladonia metacorallifera)
    x
  218. Cladonia stricta (Nyl.) Nyl. - Thomson (1984: 164), Flock (2011: 19)
    x
  219. Cladonia subfurcata (Nyl.) Arnold - Thomson (1984: 166), Flock (2011: 19)
    x
  220. Cladonia subulata (L.) Wigg. - Howard (1958: 88 as Cladonia cornutoradiata), Thomson (1984: 168)
    x
  221. Cladonia sulphurina (Michx.) Fr. - Thomson (1984: 169)
    x
  222. Cladonia symphycarpia (Ach.) Fr. - Thomson (1984: 170)
    x
  223. Cladonia thomsonii Ahti - Ahti (1978: 334 Type in Helsinki, Finland H), Thomson (1984: 171), Ahti (1993: 99)
    x
  224. Cladonia turgida Ehrh. ex Hoffm. - Thomson (1984: 172)
    x
  225. Cladonia uncialis (L.) xxx - Howard (1958: 89), Thomson (1984: 173), Flock (2011: 19)
    x
  226. Cladonia verticillata (Hoffm.) Schaer. - Thomson (1984: 174)
    x
  227. Cladonia wainioi xxx - Thomson (1984: 157 as Cladonia pseudorangiformis)

    x

  228. Clauzadea monticola (Ach. in Schaer.) Hafellner & Bellem. - Thomson (1984: 208), Flock (2011: 19)

    x

  229. Coccocarpia erythroxyli (Spreng.) Swinscow & Krog - Thomson (1984: 176)

    x

  230. Coccotrema pocillarium (Cummings) Brodo - Cummings in Cardot et al. (1904: 101 Type in CANL), Brodo (1973: 267)

    x

  231. Collema flaccidum (Ach.) Ach. - Thomson (1984: 186)
    x
  232. Collema furfuraceum (Arnold) DuRietz - Thomson (1984: 187)
    x
  233. Collema glebulentum (Nyl. ex Crombie) Degel. Thomson (1984: 185)
    x
  234. Collema leptaleum Tuck.- Nelson et al. (2011: 3)

    x

  235. Cornicularia normoerica (Gunn.) DuRietz - Thomson (1984: 201)

    x

  236. Cyphelium inquinans (Sm. in Sm. & Sow.) Trevisan - Thomson (1997: 212)
    x
  237. Cyphelium tigillare (Ach.) Ach. - Thomson (1997: 214)

    x

  238. Dactylina arctica (Richards.) Nyl. - Howard (1958: 89), Thomson (1984: 203), Flock (2011: 19)
    x
  239. Dactylina beringica Bird & Thoms. - Thomson (1984: 204), Flock (2011: 19)
    x
  240. Dactylina ramulosa (Hook.) Tuck. - Thomson (1984: 207)

    x

  241. Dendriscocaulon umhausense (Auersw.) Degel. - Thomson (1984: 371 as Polychidium umhausense)

    x

  242. Dermatocarpon arnoldianum Degel. - Thomson (1984: 210)
    x
  243. Placidium squamulosum xxx - Thomson (1984: 215 erronneously as Dermatocarpon hepaticum)
    x
  244. Dermatocarpon intestiniforme (Körb.) Hasse - Thomson (1984: 216)
    x
  245. Placidium lachneum xxx - Thomson (1984: 217 as Dermatocarpon lachneum)
    x
  246. Dermatocarpon miniatum (L.) Mann. - Thomson (1984: 219)
    x
  247. Dermatocarpon rivulorum (Arnold) Dalla Torre & Sarnth. - Thomson (1984: 220)

    x

  248. Dibaeis baeomyces (L. f.) Rambold & Hertel - Thomson (1984: 51 as Baeomyces roseus)

    x

  249. Dimelaena oreina (Ach.) Norman - Thomson (1997: 216)

    x

  250. Diploschistes muscorum (Scop.) R. Sant. - Thomson (1997: 218)
    x
  251. Diploschistes scruposus (Schreb.) Norman - Thomson (1997: 218)

    x

  252. Diplotomma alboatrum (Hoffm.) Flot. - Thomson (1997: 134 as Buellia nivalis), Geiser et al. (1998: 211 as Buellia alboatra)
    x
  253. Diplotomma epipolium (Ach.) Arnold - Thomson (1967: 461 as Rhizocarpon cumulatum Type), Feuerer (1991: 173 as Buellia epipolia), Thomson (1997: 530 as Rhizocarpon cumulatum)
    x
  254. Diplotomma nivalis (Bagl. & Carest.) xxx - xx (xx: xx as Buellia nivalis)

    x

  255. Eiglera flavida (Hepp) Hafellner - Thomson (1997: 220)

    x

  256. Enchylium bachmanianum (Fink) Otálora, P. M. Jørg. & Wedin - Thomson (1984: 179 as Collema bachmanianum)

    x

  257. Enchylium polycarpon xxx -Thomson (1984: 190 as Collema polycarpon)
    x
  258. Enchylium tenax (Sw.) xxx - Thomson (1984: 191 as Collema tenax)
    x
  259. Ephebe hispidula (Ach.) Horwood - Flock (2011: 19)
    x
  260. Epilichen scabrosus (Ach.) Clem. ex Hafellner - Thomson (1997: 221)

    x

  261. Erioderma pedicellatum (Hue) P. M. Jørg. - Nelson et al. (2009: 19 First record), Stehn et al. (2013: 2)

    x

  262. Euopsis granatina (Sommerf.) Nyl. - Thomson (1997: 223), Flock (2011: 20)
    x
  263. Euopsis pulvinata (Schaer.) Vain. - Flock (2011: 20)

    x

  264. Evernia mesomorpha Nyl. - Thomson (1984: 229)
    x
  265. Evernia perfragilis Llano - Thomson (1984: 230), Flock (2011: 20)
    x
  266. Evernia prunastri (L.) Ach. - Howard (1958: 89)

    x

  267. Farnoldia jurana (Schaer.) Hertel - Thomson (1997: 225), Flock (2011: 20)

    x

  268. Flavocetraria cucullata (Bell.) Ach. - Howard (1958: 87 sub Cetraria cucullata), Thomson (1984: 76 sub Cetraria cucullata), Flock (2011: 20)
    x
  269. Flavocetraria nivalis (L.) Kärnefelt & A. Thell - Howard (1958: 87 as Cetraria nivalis), Thomson (1984: 92 as Cetraria nivalis), Flock (2011: 20)

    x

  270. Flavoplaca citrina (Hoffm.) xxx - Geiser et al. (1998: 212 as Caloplaca citrina)
    x
  271. Flavoplaca marina (Wedd.) xxx - Thomson (1997: 166 as Caloplaca marina)

    x

  272. Gyalolechia bracteata (Hoffm.) xxx - Thomson (1997: 228 as Fulgensia bracteata)

    x

  273. Fuscidea lowensis (H. Magn.) Anderson & Hertel - Thomson (1997: 232)
    x
  274. Fuscidea mollis (Wahlenb.) V. Wirth & Vezda - Thomson (1997: 233)

    x

  275. Glypholecia scabra (Pers.) Müll. Arg. - Thomson (1997: 236)

    x

  276. Gyalecta foveolaris (Ach.) Schaer. - Thomson (1997: 238)

    x

  277. Gyalidea lecideopsis (A. Massal.) Lettau ex Vezda - Thomson (1997: 243)

    x

  278. Gyalolechia flavovirescens (Wulf.) xxx - Thomson (1997: 161 as Caloplaca flavovirescens)
    x
  279. Gyalolechia xanthostigmoidea (Räsänen) Søchting, Frödén & Arup - Thomson (1997: 158 as Caloplaca discolor), Flock (2011: 17 as Caloplaca epiphyta)

    x

  280. Halecania alpivaga (Th. Fr.) M. Mayrhofer - Flock (2011: 20 as Lecania disceptans)

    x

  281. Heppia lutosa (Ach.) Nyl. - Thomson (1997: 244)

    x

  282. Herteliana alaskensis (Nyl.) S. Ekman - Thomson (1997: 98 as Bacidia alaskensis)

    x

  283. Hymenelia epulotica (Ach.) Lutzoni - Thomson (1997: 253 as Ionaspis epulotica)
    x
  284. Hymenelia heteromorpha xxx - Thomson (1997: 254 as Ionaspis reducta), Thomson (1997: 255 as Ionaspis schismatopsis)

    x

  285. Hymenelia melanocarpa (Kremp.) Arnold - Thomson (1997: 254 as Ionaspis melanocarpa)
    x
  286. Hymenelia rhodopis xxx - Thomson (1997: 252 as Ionaspis ochromicra)

    x

  287. Hypocenomyce scalaris (Ach. ex Lilj.) M. Choisy - Thomson (1997: 248)

    x

  288. Hypogymnia austerodes (Nyl.) Räsänen - Thomson (1984: 237)
    x
  289. Hypogymnia bitteri (Lynge) Ahti - Thomson (1984: 238)
    x
  290. Hypogymnia hultenii (Degel.) Krog - Geiser et al. (1998: 212 as Cavernularia hultenii)
    x
  291. Hypogymnia lophyrea (Ach.) Krog - Geiser et al. (1998: 212 as Cavernularia lophyrea)

    x

  292. Hypogymnia physodes (L.) Nyl. - Howard (1958: 90 as Parmelia physodes), Thomson (1984: 241)
    x
  293. Hypogymnia pulverata (Nyl. ex Crombie) Elix - Nelson et al. (2011: 3)
    x
  294. Hypogymnia subobscura (Vain.) Poelt - Thomson (1984: 242), Flock (2011: 20)
    x
  295. Hypogymnia vittata (Ach.) Gas. - Thomson (1984: 243)

    x

  296. Icmadophila ericetorum (L.) Zahlbr. - Howard (1958: 89), Thomson (1997: 249)

    x

  297. Immersaria carbonoidea (J. W. Thomson) M. Barbero, Nav.-Ros. & Cl. Roux - Thomson (xx: xx Type), Thomson (1997: 334 as Lecanora carbonoidea)

    x

  298. Ionaspis lacustris (With.) Lutzoni - Thomson (1997: 245 as Hymenelia lacustris)

    x

  299. Lasallia pensylvanica (Hoffm.) Llano - Thomson (1984: 246)

    x

  300. Lathagrium fuscovirens (Ach.) xxx - Thomson (1984: 192 as Collema tuniforme)
    x
  301. Lathagrium undulatum (Laur. ex. Flot.) xxx - Thomson (1984: 194 as Collema undulatum), Flock (2011: 19 as Collema undulatum)

    x

  302. Halecania alpivaga (Th. Fr.) xxx - Thomson (1997: 257 as Lecania alpivaga)
    x
  303. Lecania subfuscula (Nyl.) S. Ekman - Thomson (1997: 108 as Bacidia sibiriensis), Thomson (1997: 111 as Bacidia subfuscula), Flock (2011: 16 as Bacidia subfuscula)

    x

  304. Lecanora albellula (Nyl.) Th. Fr. - Thomson (1997: 299 as Lecanora piniperda)
    x
  305. Lecanora aleutica H. Magn. - Thomson (1997: 265), Flock (2011: 20)
    x
  306. Lecanora argentea xxx - Thomson (1997: 281 as Lecanora fuliginosa)
    x
  307. Lecanora argopholis (Ach.) Ach. - Thomson (1997: 267)
    x
  308. Lecanora atrosulphurea (Wahlenb.) Ach. - Thomson (1997: 267), Flock (2011: 20)
    x
  309. Lecanora zosterae xxx - Thomson (1997: 270 as Lecanora behringii), Flock (2011: 20 as Lecanora behringii)
    x
  310. Lecanora caesiosulphurea Vain. - Thomson (1997: 271)
    x
  311. Lecanora circumborealis Brodo & Vitik. - Thomson (1997: 274), Flock (2011: 20)
    x
  312. Lecanora crenulata Hook. - Thomson (1997: 277)
    x
  313. Lecanora dispersa (Pers.) Sommerf. - Thomson (1997: 278)
    x
  314. Lecanora epibryon (Ach.) Ach. - Thomson (1997: 279), Flock (2011: 20)
    x
  315. Lecanora geophila (Th. Fr.) Poelt - Thomson (1997: 283)
    x
  316. Lecanora hagenii (Ach.) Ach. - Thomson (1997:286), Flock (2011: 20)
    x
  317. Lecanora impudens Degel. - Thomson (1997: 287)
    x
  318. Lecanora intricata (Ach.) Ach. - Thomson (1997: 288)
    x
  319. Lecanora leptacina Sommerf. - Thomson (1997: 289)
  320. Lecanora luteovernalis Brodo - Thomson (1997: 290)
  321. Lecanora marginata (Schaer.) Hertel & Rambold - Thomson (1997: 291)
  322. Lecanora microfusca Lynge - Thomson (1997: 294)
  323. Lecanora nordenskioeldii Vain. - Thomson (1997: 296)
  324. Lecanora orae-frigidae Sant. - Thomson (1997: 297), Flock (2011: 20)
  325. Lecanora polytropa (Ehrh. in Hoffm.) Rabenh. - Thomson (1997: 299), Flock (2011: 21)
  326. Lecanora pulicaris - Thomson (1997: 301)
  327. Lecanora rupicola (L.) Zahlbr. - Thomson (1997: 303)
  328. Lecanora salicicola H. Magn. - Thomson (1997: 304)
  329. Lecanora saxicola (Pollich) Ach. - Thomson (1997: 295 as Lecanora muralis)
  330. Lecanora straminea (Wahlenb.) Ach. - Thomson (1997: 306), Flock (2011: 21)
  331. Lecanora subintricata (Nyl.) Th. Fr. - Thomson (1997: 307)
  332. Lecanora symmicta (Ach.) Ach. - Thomson (1997: 309), Flock (2011: 21)
  333. Lecanora torrida Vain. - Thomson (1997: 310)
  334. Lecanora varia (Hoffm.) Ach. - Thomson (1997: 311)
    x
  335. Lecanora xylophila xxx - Thomson (1997: 284 as Lecanora grantii)
  336. Lecanora zosterae (Ach.) Nyl. - Thomson (1997: 312)

  337. Lecidea alpestris (Ramond ex Lam. & DC.) Schaerer - Thomson (1997: 326)
  338. Lecidea atrobrunnea (Ramond ex Lam. & DC.) Schaerer - Thomson (1997: 327)
  339. Lecidea atrofulva Sommerf. - Thomson (1997: 328)
  340. Lecidea auriculata Th. Fr. - Thomson (1997: 329)
  341. Lecidea berengeriana (A. Massal.) Th. Fr. - Thomson (1997: 331)
  342. Lecidea brachyspora (Th. Fr.) Nyl. - Thomson (1997: 333)
  343. Lecidea caesioatra Schaer. - Flock (2011: 21)
  344. Lecidea cinnabarina Sommerf. - Thomson (1997: 336)
  345. Lecidea confluens (W. A. Weber) Ach. - Thomson (1997: 339)
  346. Lecidea cuprea Sommerf. - Thomson (1997: 341)
  347. Lecidea diapensiae Th. Fr. - Thomson (1997: 342)
  348. Lecidea diducens Nyl. - Thomson (1997: 343)
  349. Lecidea ecrustacea (Anzi ex Arnold) Arnold - Thomson (1997: 343)
  350. Lecidea ementiens Nyl. - Thomson (1997: 344)
  351. Lecidea fuscoatra (L.) Ach. - Thomson (1997: 347)
  352. Lecidea hypocrita A. Massal. - Thomson (1997: 353)
  353. Lecidea lactea Flörke ex Schaerer - Thomson (1997: 355)
  354. Lecidea lapicida (Ach.) Ach. - Thomson (1997: 357), Flock (2011: 21)
  355. Lecidea leucophaea (Flörke ex Rabenh.) Nyl. - Thomson (1997: 359)
  356. Lecidea leucothallina Arnold - Thomson (1997: 360)
  357. Lecidea limosa Ach. - Thomson (1997: 361)
  358. Lecidea lithophila (Ach.) Ach. - Thomson (1997: 362)
  359. Lecidea pallida Th. Fr. - Thomson (1997: 367)
  360. Lecidea parasemella Nyl. - Thomson (1997: 366)
  361. Lecidea paupercula Th. Fr. - Thomson (1997: 369)
  362. Lecidea plebeja Nyl. - Thomson (1997: 374)
  363. Lecidea ramulosa Th. Fr. - Thomson (1997: 376)
  364. Lecidea steineri Hertel - Thomson (1997: 380)
  365. Lecidea subcandida H. Magn. - Thomson (1997: 381)
  366. Lecidea tessellata Flörke - Thomson (1997: 384)
  367. Lecidea tornoënsis Nyl. - Thomson (1997: 387)
  368. Lecidea turgidula Fr. - Thomson (1997: 388)
  369. Lecidea umbonata (Hepp.) Mudd - Thomson (1997: 389)
  370. Lecidea vernalis (L.) Ach. - Thomson (1997: 389)

  371. Lecidella bullata Körb. - Thomson (1997: 393)
  372. Lecidella carpathica Körb. - Thomson (1997: 395)
  373. Lecidella elaeochroma (Ach.) Hazslin - Thomson (1997: 396)
  374. Lecidella euphorea (Flörke) Hertel - Thomson (1997: 398), Flock (2011: 21)
  375. Lecidella inamoena (Müll. Arg.) Hertel - Thomson (1997: 399)
  376. Lecidella stigmatea (Ach.) Hertel & Leuck. - Thomson (1997: 402), Flock (2011: 21)
  377. Lecidella wulfenii (Hepp) Körb. - Thomson (1997: 403)

  378. Lecidoma demissum (Rutstr.) Schneider & Hertel - Thomson (1997: 405), Flock (2011: 21)

  379. Leciophysma finmarkicum Th. Fr. - Thomson (1984: 248), Flock (2011: 21)
  380. Leciophysma furfurascens (Nyl.) Gyel. - Thomson (1984: 249)

  381. Lempholemma radiatum (Sommerf.) Henssen - Thomson (1997: 407)

  382. Leprocaulon subalbicans (J. M. Lamb) J. M. Lamb & Ward - Thomson (1984: 250)

    x

  383. Leproplaca cirrochroa (Ach.) Th. Fr. - Thomson (1997: 155 as Caloplaca cirrochroa)

    x

  384. Leptochidium albociliatum (Desm.) M. Choisy - Thomson (1984: 252)

    x

  385. Leptogium arcticum P. M. Jørg. - Thomson (1984: 255)
    x
  386. Leptogium lichenoides (L.) Otálora, P. M. Jørg. & Wedin - Thomson (1984: 257)
  387. Leptogium lichenoides (L.) Zahlbr. var. pulvinatum (Hoffm.) Zahlbr. - Howard (1958: 89)
  388. Leptogium palmatum (Huds.) Mont. in Webb. & Berth. - Thomson (1984: 260)
  389. Leptogium saturninum (Dicks.) Nyl. Thomson (1984: 262)
  390. Leptogium sinuatum (Huds.) A. Massal. - Thomson (1984: 263)
  391. Leptogium tenuisimum (Dicks.) Fr. - Thomson (1984: 264)

    x

  392. Lichenomphalia hudsoniana (H. S. Jenn.) Redhead, Lutzoni, Moncalvo & Vilgalys - Thomson (1984: 196 as Coriscium viride), Flock (2011: 24 as Phytoconis viridis)

    x

  393. Lithographa tesserata (DC.) Nyl. - Flock (2011: 21)
  394. Lobaria hallii (Tuck.) Zahlbr. - Thomson (1984: 266)
  395. Lobaria kurokawae Yoshim. - Thomson (1984: 267)
  396. Lobaria linita (Ach.) Rabenh. - Howard (1958: 89), Thomson (1984: 269), Flock (2011: 21)
  397. Lobaria pseudopulmonaria Gyeln. - Thomson (1984: 270)
  398. Lobaria pulmonaria (L.) Hoffm. - Howard (1958: 89), Nelson et al. (2009: 20)
  399. Lobaria scrobiculata (Scop.) DC. - Thomson (1984: 271), Nelson et al. (2009: 20)

  400. Lobothallia alphoplaca (Wahlenb. in Ach.) xxx - Thomson (1997: 59 as Aspicilia alphoplaca)
  401. Lobothallia melanaspis (Ach.) Poelt & Leuck. - Thomson (1997: 82 as Aspicilia melanaspis)

  402. Lopadium coralliodeum (Nyl.) Lynge - Thomson (1997: 409), Flock (2011: 21)
  403. Lopadium pezizoideum (Ach.) Körb. - Thomson (1997: 411), Flock (2011: 21)

    x

  404. Masonhalea inermis (Nyl.) Lumbsch, M. Nelsen & A. Thell - Thomson (1984: 83 as Cetraria inermis)
    x
  405. Masonhalea richardsonii (Hook.) Kärnef. - Howard (1958: 87 sub Cetraria richardsonii), Thomson (1984: 273), Flock (2011: 21)

    x

  406. Massalongia carnosa (Dicks.) Körb. - Thomson (1984: 274)

    x

  407. Megalaria jemtlandica xxx - Thomson (1997: 197 as Catillaria jemtlandica)

    x

  408. Megaspora verrucosa (Ach.) Hafellner & V. Wirth in V. Wirth - Flock (2011: 22)

    x

  409. Melanelia hepatizon (Ach.) A. Thell - Thomson (1984: 82 as Cetraria hepatizon), Flock (2011: 18 as Cetraria hepatizon)
    x
  410. Melanelia stygia (L.) Essl. - Flock (2011: 22)

    x

  411. Melanelixia fuliginosa (Fr. ex Duby) xxx - Thomson (1984: 303 sub Parmelia glabratula)
    x
  412. Melanelixia subaurifera (Nyl.) xxx - Thomson (1984: 316 sub Parmelia subaurifera)

    x

  413. Melanohalea elegantula (Zahlbr.) xxx - Thomson (1984: 300 sub Parmelia elegantula)
    x
  414. Melanohalea exasperatula (Nyl.) xxx - Thomson (1984: 300 sub Parmelia exasperatula)
    x
  415. Melanohalea infumata (Nyl.) xxx - Thomson (1984: 304 sub Parmelia infumata)
    x
  416. Melanohalea olivacea (L.) xxx - Howard (1958: 90 sub Parmelia olivacea), Thomson (1984: 306 sub Parmelia olivacea)
    x
  417. Melanohalea olivaceoides (Krog) xxx - Thomson (1984: 306 sub Parmelia olivaceoides)
    x
  418. Melanohalea septentrionalis (Lynge) xxx - Thomson (1984: 311 sub Parmelia septentrionalis)

  419. Micarea assimilata (Nyl.) Coppins - Thomson (1997: 413)
  420. Micarea crassipes (Th. Fr.) Coppins - Thomson (1997: 414)
  421. Micarea incrassata Hedl. - Thomson (1997: 416), Flock (2011: 22)
  422. Micarea lignaria (Ach.) Hedl. - Thomson (1997: 417)
  423. Micarea melaena (Nyl.) Hedl. - Thomson (1997: 419)
  424. Micarea ternaria (Nyl.) Vezda - Thomson (1997: 420)
  425. Micarea turfosa (A. Massal.) Du Rietz - Thomson (1997: 420)

    x

  426. Montanelia disjuncta (Erichs.) xxx - Thomson (1984: 299 sub Parmelia disjuncta)
    x
  427. Montanelia panniformis (Nyl.) xxx - Thomson (1984: 309 sub Parmelia panniformis)
    x
  428. Montanelia sorediata (Ach.) xxx - Thomson (1984: 312 sub Parmelia sorediosa)
    x
  429. Montanelia tominii (Oksner) xxx - Thomson (1984: 317 sub Parmelia substygia)

    x

  430. Mycobilimbia berengeriana (A. Massal.) Hafellner & V. Wirth - Flock (2011: 22)
    x
  431. Mycobilimbia pilularis xxx - Thomson (1997: 110 as Bacidia sphaeroides)
    x
  432. Mycobilimbia tetramera (Sommerf.) xxx - Thomson (1997: 422 as Mycobilimbia obscurata)

  433. Mycoblastus affinis (Schaer.) Schauer - Thomson (1997: 424), Flock (2011: 22)
  434. Mycoblastus alpinus (Fr.) Kernst. - Thomson (1997: 425)
  435. Mycoblastus marginatus Degel. - Thomson (1997: 424)
  436. Mycoblastus sanguinarius (L.) Norman - Thomson (1997: 426), Flock (2011: 22)

  437. Mycobilimbia microcarpa (Th. Fr.) Brunnb. - Thomson (1997: 105 as Bacidia microcarpa)
  438. Mycobilimbia pilularis xxx - Flock (2011: 17 as Biatora sphaeroides)

  439. Mycocalicium subtile (Pers.) Szat. - Thomson (1997: 428)

    x

  440. Myriospora smaragdula (Wahlenb. in Ach.) xxx - Thomson (1997: 34 as Acarospora smaragdula)

    x

  441. Nephroma arcticum (L.) Torss. - Howard (1958: 89), Thomson (1984: 277), Flock (2011: 22)
  442. Nephroma bellum (Spreng.) Tuck. - Thomson (1984: 278)
  443. Nephroma expallidum (Nyl.) Nyl. - Thomson (1984: 279)
  444. Nephroma isidiosum (Nyl.) Gyeln. - Thomson (1984: 281), Nelson et al. (2009: 20)
  445. Nephroma parile (Ach.) Ach. - Thomson (1984: 282)
  446. Nephroma resupinatum (L.) Ach. - Thomson (1984: 283)

  447. Ochrolechia androgyna (Hoffm.) Arnold - Thomson (1997: 430)
  448. Ochrolechia frigida (Sw.) Lynge - Howard (1958: 90), Thomson (1997: 431), Flock (2011: 22)
  449. Ochrolechia grimmiae Lynge - Thomson (1997: 432), Flock (2011: 22)
  450. Ochrolechia gyalectina (Nyl.) Zahlbr. - Thomson (1997: 433), Flock (2011: 22)
  451. Ochrolechia inaequatula (Nyl.) Zahlbr. - Howard (1958: 90), Thomson (1997: 434)
  452. Ochrolechia subplicans (Nyl.) Brodo - Thomson (1997: 435), Flock (2011: 22)
  453. Ochrolechia tartarea (L.) A. Massal. - Howard (1958: 90)
  454. Ochrolechia upsaliensis (L.) A. Massal. - Howard (1958: 90), Thomson (1997: 436)

  455. Opegrapha saxicola Ach. - Thomson (1997: 438)

  456. Ophioparma lapponica (Räsänen) Hafellner & Rogers - Thomson (1997: 440), Flock (2011: 22)
  457. Ophioparma ventosum (L.) Norman - Howard (1958: 89 sub Haematomma ventosum)

  458. Orphniospora moriopsis (A. Massal.) D. Hawksw. - Thomson (1997: 441)

  459. Pachyospora verrucosa (Ach.) A. Massal. - Thomson (1997: 443 as Pachyospora verrucosa)

    x

  460. Pachypeltis invadens (Lynge) xxx - Thomson (1997: 165 as Caloplaca invadens)

  461. Parmelia fraudans (Nyl.) Nyl. - Thomson (1984: 302)
  462. Parmelia omphalodes (L.) Ach. - Howard (1958: 90), Thomson (1984: 308), Flock (2011: 23)
  463. Parmelia saxatilis (L.) Ach. - Howard (1958: 90), Thomson (1984: 310), Flock (2011: 23)
  464. Parmelia skultii Hale - Hale (1987: 43 Type in Washington, USA US), Flock (2011: 23)
  465. Parmelia squarrosa Hale - Hale (1971: 29)
  466. Parmelia sulcata Tayl. - Howard (1958: 90), Thomson (1984: 318)

  467. Parmeliella arctophila (Th. Fr.) Malme - Thomson (1984: 320)
  468. Parmeliella praetermissa (Nyl.) James - Thomson (1984: 320)

  469. Parmeliopsis aleurites (Ach.) Nyl. em. Lettau - Thomson (1984: 321)
  470. Parmeliopsis ambigua (Wulf.) Nyl. - Thomson (1984: 325), Flock (2011: 23)
  471. Parmeliopsis hyperopta (Ach.) Arnold - Thomson (1984: 326)

    x

  472. Parvoplaca tiroliensis (Zahlbr.) xxx - Thomson (1997: 173 as Caloplaca tiroliensis)

  473. Peltigera aphthosa (L.) Willd. var. aphthosa - Howard (1958: 90), Thomson (1984: 329)
  474. Peltigera aphthosa (L.) Willd. var. variolosa (A. Massal.) Thomson - Howard (1958: 90)
  475. Peltigera canina (L.) Willd. var. canina - Howard (1958: 91)
  476. Peltigera canina (L.) Willd. var. albescens (Wahlbr.) Thomson - Howard (1958: 91)
  477. Peltigera canina (L.) Willd. f. sorediata Schaer. - Thomson (1984: 332)
  478. Peltigera collina (Ach.) Schrad. - Thomson (1984: 334)
  479. Peltigera horizontalis (Huds.) Baumg. - Thomson (1984: 337)
  480. Peltigera lepidophora (Nyl.) Vain. - Thomson (1984: 338)
  481. Peltigera leucophlebia (Nyl.) Gyeln. - Thomson (1984: 330 as Peltigera aphthosa var. leucophlebia), Flock (2011: 23)
  482. Peltigera malacea (Ach.) Funck - Howard (1958: 91), Thomson (1984: 339)
  483. Peltigera membranacea (Ach.) Nyl. - Thomson (1984: 340), Flock (2011: 23)
  484. Peltigera polydactyla (Neck.) Hoffm. - Thomson (1984: 343)
  485. Peltigera polydactyla var. crassoides Gyeln. - Howard (1958: 91)
  486. Peltigera rufescens (Weis.) xxx - Thomson (1984: 333 as Peltigera canina var. rufescens)
  487. Peltigera scabrosa Th. Fr. - Thomson (1984: 344), Flock (2011: 23)
  488. Peltigera venosa (L.) Baumg. - Thomson (1984: 345)

  489. Pertusaria alaskensis Erichsen - Thomson (1997: 446), Flock (2011: 23)
  490. Pertusaria alpina Hepp ex Ahles - Thomson (1997: 447)
  491. Pertusaria bryontha (Ach.) Nyl. - Thomson (1997: 449), Flock (2011: 23)
  492. Pertusaria bryophaga Erichsen - Thomson (1997: 450)
  493. Pertusaria carneopallida (Nyl.) Anzi ex Nyl. - Thomson (1997: 451)
  494. Pertusaria coriacea (Th. Fr.) Th. Fr. - Thomson (1997: 452), Flock (2011: 23)
  495. Pertusaria dactylina (Ach.) Nyl. - Thomson (1997: 453), Flock (2011: 23)
  496. Pertusaria excludens Nyl. - Thomson (1997: 455)
  497. Pertusaria geminipara (Th. Fr.) Knight ex Brodo - Thomson (1997: 455)
  498. Pertusaria glomerata (Ach.) Schaerer - Thomson (1997: 456), Flock (2011: 23)
  499. Pertusaria octomela (Norman) Erichsen - Thomson (1997: 457)
  500. Pertusaria oculata (Dickson) Th. Fr. - Thomson (1997: 458), Flock (2011: 23)
  501. Pertusaria panyrga (Ach.) A. Massal. - Thomson (1997: 459), Flock (2011: 24)
  502. Pertusaria sommerfeltii (Flörke ex Sommerf.) Fr. - Thomson (1997: 461)
  503. Pertusaria subdactylina Nyl. - Thomson (1997: 461)
  504. Pertusaria subobducens Nyl. - Thomson (1997: 462), Flock (2011: 24)
  505. Pertusaria trochisea Norman - Thomson (1997: 463)
  506. Pertusaria xanthostoma (Sommerf.) Fr. - Thomson (1997: 464)

  507. Phaeophyscia constipata (Norrl. & Nyl.) - Thomson (1984: 347)
  508. Phaeophyscia endococcinea (Körb.) Moberg - Thomson (1984: 348)
  509. Phaeophyscia sciastra (Ach.) Moberg - Thomson (1984: 349), Flock (2011: 24)

  510. Phaeorrhiza nimbosa (Fr.) Mayrh. & Poelt - Thomson (1997: 467)

  511. Phylliscum demangeonii (Moug. & Mont in Mont.) Nyl. - Thomson (1997: 469)

  512. Physcia adscendens (Fr.) Oliv. - Thomson (1984: 352)
  513. Physcia aipolia (Humb.) Fürnrohr. - Thomson (1984: 353)
  514. Physcia caesia (Hoffm.) Fürnrohr. - Thomson (1984: 354)
  515. Physcia dubia (Hoffm.) Lettau - Thomson (1984: 355)

  516. Physconia detersa (Nyl.) Poelt - Thomson (1984: 359)
  517. Physconia muscigena (Ach.) Poelt - Howard (1958: 91 sub Physcia muscigena), Thomson (1984: 360)

    x

  518. Pilophorus cereolus (Ach.) Th. Fr. in Hellbom - Flock (2011: 24)
    x
  519. Pilophorus dovrensis (Nyl.) Timdal, Hertel & Rambold - Flock (2011: 24)
    x
  520. Pilophorus robustus Th. Fr. - Thomson (1984: 363), Flock (2011: 24)

  521. Placopsis cribellans (Nyl.) Räsänen - Thomson (1997: 471)
  522. Placopsis gelida (L.) Lindsay - Thomson (1997: 472), Flock (2011: 24)

  523. Placynthiella oligotropha (J. R. Laundon) Coppins & James - Thomson (1997: 474)
  524. Placynthiella uliginosa (Schrad.) Coppins & James - Thomson (1997: 475)

    x

  525. Placynthium asperellum (Ach.) Trevisan - Thomson (1984: 365 as Placynthium aspratile), Flock (2011: 24)
    x
  526. Placynthium nigrum (Huds.) Gray - Thomson (1984: 366), Flock (2011: 24)

  527. Platismatia glauca (L.) C. F. Culb. & W. L. Culb. - Howard (1958: 87 sub Platismatia clauca sic!), Thomson (1984: 368)

  528. Pleopsidium chlorophanum (Wahlenb.) Zopf - Thomson (1997: 22 as Acarospora chlorophana)

    x

  529. Polyblastia cucurbitula W. Thomson & B. M. Murray - Flock (2011: 24)
  530. Polyblastia gelatinosa (Ach.) Th. Fr. - Thomson (1997: 480)
  531. Polyblastia gothica Th. Fr. - Thomson (1997: 480)
  532. Polyblastia hyperborea Th. Fr. - Thomson (1997: 481)
  533. Polyblastia theleodes (Sommerf.) Th. Fr. - Thomson (1997: 484), Flock (2011: 24)

    x

  534. Polycauliona candelaria (L.) Frödén, Arup, & Søchting - Howard (1958: 92 as Xanthoria candelaria), Thomson (1984: 483 as Xanthoria candelaria), Flock (2011: 28 as Xanthoria candelaria)
    x
  535. Polycauliona flavogranulosa (Arup) xxx - Geiser et al. (1998: 212 as Caloplaca flavogranulosa)
    x
  536. Polycauliona polycarpa (Ehrh.) Rieber - Thomson (1984: 487 as Xanthoria polycarpa)
    x
  537. Polycauliona verruculifera (Vain.) xxx -Thomson (1997: 177 as Caloplaca verruculifera), Geiser et al. (1998: 212 as Caloplaca verruculifera)

    x

  538. Polychidium muscicola (Sw.) Gray - Thomson (1984: 370), Flock (2011: 24)
    x
  539. Polysporina simplex (Davis) Vezda - Thomson (1997: 486)

    x

  540. Porocyphus coccodes (Flot.) Körb. - Thomson (1997: 488)

    x

  541. Porpidia flavicunda (Ach.) Gowan - Thomson (1997: 491)
  542. Porpidia flavocoerulescens (Hornem.) Hertel & Schwab - Thomson (1997: 492), Flock (2011: 24)
  543. Porpidia grisea Gowan - Gowan (1989: 48 Type in WIS), Thomson (1997: 493)
  544. Porpidia lowiana Gowan - Thomson (1997: 494)
  545. Porpidia speirea (Ach.) Kremp. - Thomson (1997: 497), Flock (2011: 25)
  546. Porpidia superba (Körb.) Hertel & Knoph - Thomson (1997: 498)
  547. Porpidia thomsonii Gowan - Thomson (1997: 498), Flock (2011: 25)
  548. Porpidia tuberculosa (Sm. in Sm. & Sow.) Hertel & Knoph - Thomson (1997: 500)
  549. Porpidia zeoroides (Anzi) Knoph & Hertel - Thomson (1997: 500), Flock (2011: 25)

  550. Protoblastenia calva (Dickson) Zahlbr. - Thomson (1997: 502), Flock (2011: 25)
  551. Protoblastenia rupestris (Scop.) Steiner - Thomson (1997: 503), Flock (2011: 25)
  552. Protoblastenia terricola (Anzi) Lynge - Thomson (1997: 503)

  553. Protopannaria pezizoides (Web.) xxx - Thomson (1984: 294 as Pannaria pezizoides), Flock (2011: 23 as Pannaria pezizoides)

    x

  554. Protoparmelia badia (Hoffm.) Hafellner - Thomson (1997: 269 as Lecanora badia), Flock (2011: 25)

  555. Protothelenella sphinctrinoides (Nyl.) Mayrh. & Poelt - Thomson (1997: 505)

    x

  556. Pseudephebe minuscula (Nyl. ex Arn.) Brodo & D. Hawksw. - Thomson (1984: 373)
    x
  557. Pseudephebe pubescens (L.) M. Choisy - Howard (1958: 90 sub Parmelia pubescens), Thomson (1984: 374), Flock (2011: 25)

  558. Pseudocyphellaria anomala Brodo & Ahti - Nelson et al. (2009: 20)
  559. Pseudocyphellaria crocata (L.) Vain. - Nelson et al. (2009: 20)

  560. Psora decipiens (Hedwig) Hoffm. - Thomson (1997: 507)
  561. Psora globifera (Ach.) A. Massal. - Thomson (1997: 508)
  562. Psora himalayana (Bab.) Timdal - Thomson (1997: 507), Flock (2011: 25)
  563. Psora nipponica (Zahlbr.) Schneider - Thomson (1997: 510)
  564. Psora rubiformis (Ach.) Hook. - Thomson (1997: 511)
  565. Psora tenuifolia Timdal - Thomson (1997: 512)

  566. Psoroma hypnorum (Vahl) Gray - Thomson (1984: 375), Flock (2011: 25)

  567. Pyrenopsis myriospora Dahl - Thomson (1997: 517)
  568. Pyrenopsis pulvinata (Schaer.) Th. Fr. - Thomson (1997: 518)

    x

  569. Ramboldia gowardiana (T. Sprib. & Hauck) Kalb, Lumbsch & Elix - Spribille & Hauck (2003: 560 as Pyrrhospora gowardiana)

    x

  570. Ramalina almquistii Vain. - Howard (1958: 91), Thomson (1984: 232 as Fisturiella almquistii), Flock (2011: 25)
    x
  571. Ramalina pollinaria (Westr.) Ach. - Thomson (1984: 381)
    x
  572. Ramalina roesleri (Hoechst. ex Schaer.) Hue - Thomson (1984: 233 as Fisturiella roesleri)
    x
  573. Ramalina scoparia Vain. - Thomson (1984: 234 as Fisturiella scoparia), Flock (2011: 25)
    x
  574. Ramalina thrausta (Ach.) Nyl. - Thomson (1984: 382), Elix & Tønsberg (2005: 36)

    x

  575. Rhizocarpon alaxense Thomson - Thomson (1997: 522)
    x
  576. Rhizocarpon anseris Lynge - Thomson (1997: 523)
    x
  577. Rhizocarpon badioatrum (Flörke ex Sprengel) Th. Fr. - Thomson (1997: 524)
    x
  578. Rhizocarpon chinoneum (Norman) Th. Fr. - Thomson (1997: 527), Flock (2011: 25)
    x
  579. Rhizocarpon concentricum (Davis) Beltr. - Thomson (1997: 529)
  580. Rhizocarpon copelandii (Körb.) Th. Fr. - Thomson (1997: 531), Flock (2011: 25)
  581. Rhizocarpon eupetraeoides (Nyl.) Blomb. & Forss. - Thomson (1997: 532)
  582. Rhizocarpon eupetraeum (Nyl.) Arnold - Thomson (1997: 533), Flock (2011: 25)
  583. Rhizocarpon geminatum Körb. - Thomson (1997: 537)
  584. Rhizocarpon geographicum (L.) DC. - Thomson (1997: 538), Flock (2011: 25)
  585. Rhizocarpon grande (Flörke ex Flotow) Arnold - Thomson (1997: 539)
  586. Rhizocarpon hochstetteri (Körb.) Vain. - Thomson (1997: 540)
  587. Rhizocarpon inarense (Vain.) Vain. - Thomson (1997: 541), Flock (2011: 25)
  588. Rhizocarpon norvegicum Räsänen - Thomson (1997: 544)
  589. Rhizocarpon polycarpum (Hepp) Th. Fr. - Thomson (1997: 546)
  590. Rhizocarpon pusillum Runem. - Thomson (1997: 547)
  591. Rhizocarpon riparium Räsänen - Thomson (1997: 548)
  592. Rhizocarpon rittokense (Hellbom) Th. Fr. - Thomson (1997: 549)
  593. Rhizocarpon superficiale (Schaer.) Vain. - Thomson (1997: 551), Flock (2011: 25)
  594. Rhizocarpon umbilicatum (Ramond) Flagey - Thomson (1997: 552)

  595. Rhizoplaca chrysoleuca (Sm.) Zopf - Thomson (1997: 554)
  596. Rhizoplaca melanophthalma (Ram.) Leuck. & Poelt - Thomson (1997: 555)
  597. Rhizoplaca peltata (Ram.) Leuckert & Poelt - Thomson (1997: 555)

  598. Rinodina archaea (Ach.) Vain. - Thomson (1997: 560)
  599. Rinodina bischoffii (Hepp.) A. Massal. - Thomson (1997: 561)
  600. Rinodina cacuminum (Th. Fr.) Malme - Thomson (1997: 561)
  601. Rinodina calcigena (Th. Fr.) Lynge - Thomson (1997: 562)
  602. Rinodina granulans Vain. - Thomson (1997: 564)
  603. Rinodina mniaraea (Ach.) Körb. - Thomson (1997: 567)
  604. Rinodina mucronatula H. Magn. - Thomson (1997: 568)
    x
  605. Rinodina notabilis (Lynge) Sheard - Thomson (1997: 134 as Buellia notabilis)
    x
  606. Rinodina roscida (Sommerf.) Arnold - Thomson (1997: 569), Flock (2011: 25)
  607. Rinodina septentrionalis Malme - Thomson (1997: 570)
  608. Rinodina sheardii Tønsberg - Tønsberg (1992: 216 Type in BG)
  609. Rinodina turfacea (Wahlenb.) Körb. - Thomson (1997: 571), Flock (2011: 25)

  610. Ropalospora lugubris (Sommerf.) Poelt - Thomson (1997: 571), Flock (2011: 26)

    x

  611. Rostania ceranisca (Nyl.) xxx - Thomson (1984: 182 as Collema ceraniscum)

    x

  612. Rusavskia elegans (Link) S. Y. Kondr. & Kärnefelt - Howard (1958: 87 sub Caloplaca elegans), Thomson (1984: 484 as Xanthoria elegans), Flock (2011: 28 as Xanthoria elegans var. splendens)

    x

  613. Rusavskia sorediata (Vain.) S. Y. Kondr. & Kärnefelt - Thomson (1984: 487 as Xanthoria sorediata), Flock (2011: 28 as Xanthoria sorediata)

  614. Sagiolechia rhexoblephara (Nyl.) Zahlbr. - Thomson (1997: 575)

  615. Sarcogyne regularis Körb. - Thomson (1997: 579)

    x

  616. Sarcosagium campestre (Fr.) Poetsch & Schiedem. - Thomson (1997: 119 as Biatorella campestris)

    x

  617. Schadonia fecunda (Th. Fr.) Vezda & Poelt - Thomson (1997: 581)

  618. Schaereria cinereorufa (Schaer.) Th. Fr. - Thomson (1997: 582)
  619. Schaereria tenebrosa (Flot.) Hertel & Poelt - Thomson (1997: 584)

    x

  620. Scytinium callopismum (A. Massal.) xxx - Thomson (1984: 180 as Collema callopismum)

  621. Silobia scabrida (H. Magn.) M. Westb. & Wedin - Thomson (1997: 32 as Acarospora scabrida)

  622. Siphula ceratites (Wahlenb.) Fr. - Howard (1958: 91), Thomson (1984: 384), Flock (2011: 26)

  623. Solorina bispora Nyl. - Thomson (1984: 386), Flock (2011: 26)
  624. Solorina crocea (L.) Ach. - Howard (1958: 91), Thomson (1984: 387), Flock (2011: 26)
  625. Solorina octospora (Arnold) Arnold - Thomson (1984: 389), Flock (2011: 26)
  626. Solorina saccata (L.) Ach. - Thomson (1984: 390), Flock (2011: 26)
  627. Solorina spongiosa (Sm.) Anzi - Thomson (1984: 391), Flock (2011: 26)

  628. Sphaerophorus fragilis (L.) Pers. - Thomson (1984: 393), Flock (2011: 26)
  629. Sphaerophorus globosus (Huds.) Vain. - Howard (1958: 91), Thomson (1984: 394), Flock (2011: 26)

    x

  630. Sphinctrina turbinata (Pers. ex Fr.) de Not. - Thomson (1997: 568)

    x

  631. Spilonema revertens Nyl. - Flock (2011: 26)
    x
  632. Sporastatia polyspora (Nyl.) Grumm. - Thomson (1997: 588), Flock (2011: 26)
    x
  633. Sporastatia testudinea (Ach.) A. Massal. - Thomson (1997: 589)

  634. Staurothele areolata (Ach.) Lettau - Thomson (1997: 592)
  635. Staurothele discendens (Nyl.) Zahlbr. - Thomson (1997: 593)
  636. Staurothele drummondii (Tuck.) Tuck. - Thomson (1997: 595)
  637. Staurothele fissa (Tayler) Zwackh. - Thomson (1997: 596)

  638. Stereocaulon alpinum Laur. - Howard (1958: 91), Thomson (1984: 400), Flock (2011: 26)
  639. Stereocaulon apocalypticum Nyl. - Thomson (1984: 401 as "apocalyptum"), Flock (2011: 26)
  640. Stereocaulon arcticum Lynge - Thomson (1984: 402), Flock (2011: 26)
  641. Stereocaulon arenarium (Sav.) I. M. Lamb - Thomson (1984: 403), Flock (2011: 27)
  642. Stereocaulon botryosum Ach. em. Frey - Thomson (1984: 405), Flock (2011: 27)
  643. Stereocaulon coniophyllum I. M. Lamb - Thomson (1984: 409)
  644. Stereocaulon dactylophyllum Flörke - Thomson (1984: 410)
  645. Stereocaulon glareosum (Sav.) H. Magn. - Thomson (1984: 412), Flock (2011: 27)
  646. Stereocaulon grande (H. Magn.) H. Magn. - Thomson (1984: 413), Flock (2011: 27)
    x
  647. Stereocaulon groenlandicum (E. Dahl) I. M. Lamb - Thomson (1984: 414)
  648. Stereocaulon incrustatum Flörke - Thomson (1984: 415)
  649. Stereocaulon intermedium (Sav.) H. Magn. - Howard (1958: 91), Thomson (1984: 417), Flock (2011: 27)
  650. Stereocaulon nivale xxx - Geiser et al. (1998: 210 as Bacidia nivalis)
  651. Stereocaulon paschale (L.) Hoffm. - Howard (1958: 91), Thomson (1984: 418), Flock (2011: 27)
  652. Stereocaulon rivulorum H. Magn. - Thomson (1984: 421), Flock (2011: 27)
  653. Stereocaulon saviczii Du Rietz - Thomson (1984: 422)
  654. Stereocaulon saxatile H. Magn. - Thomson (1984: 423)
  655. Stereocaulon spathuliferum Vain. - Thomson (1984: 425)
  656. Stereocaulon subcoralloides (Nyl.) Nyl. - Thomson (1984: 426)
  657. Stereocaulon symphycheilum I. M. Lamb - Thomson (1984: 426)
  658. Stereocaulon tomentosum E. Fries - Howard (1958: 91), Thomson (1984: 428)
  659. Stereocaulon vesuvianum Pers. - Thomson (1984: 430), Flock (2011: 27)

  660. Sticta arctica Degel. - Thomson (1984: 433)
  661. Sticta weigelii (Isert ex Ach.) Vain. - Thomson (1984: 434)

  662. Strigula sychnogonioides (Nitschke) R. C. Harris - Thomson (1997: 234 as Geisleria sychnogonioides)

    x

  663. Tephromela atra (Huds.) Hafellner - Thomson (1997: 633)

    x

  664. Tetramelas papillatus (Sommerf.) Kalb - Thomson (1997: 136 as Buellia papillata), Geiser et al. (1998: 211 as Buellia papillata)
    x
  665. Tetramelas pulverulentus (Anzi) A. Nordin & Tibell - Thomson (1997: 137 as Buellia pulverulenta)
    x
  666. Tetramelas terricolus xxx - Thomson (1997: 133 erroneously as Buellia geophila)

    x

  667. Thamnolia subuliformis (Ehrh.) W. L. Culb. - Thomson (1984: 438), Flock (2011: 27)
    x
  668. Thamnolia vermicularis (Sw.) Ach. - Howard (1958: 91), Thomson (1984: 438), Flock (2011: 27)

    x

  669. Thelidium aeneovinosum (Anzi) Arnold - Thomson (1997: Arnold 605)
    x
  670. Thelidium minutulum Körb. - Thomson (1997: 605)
    x
  671. Thelidium papulare (Fr.) Arnold - Thomson (1997: 607)
    x
  672. Thelidium pyrenophorum (Ach.) Mudd - Thomson (1997: 607), Flock (2011: 27)

  673. Thrombium epigaeum (Pers.) Wallr. - Thomson (1997: 610)

  674. Toninia caeruleonigricans (Lightf.) Th. Fr. - Thomson (1997: 614)
  675. Toninia cumulata (Sommerf.) Th. Fr. - Thomson (1997: 616)
  676. Toninia lobulata (Sommerf.) Lynge - Thomson (1997: 617)
  677. Toninia tristis (Th. Fr.) Th. Fr. - Thomson (1997: 620)

  678. Trapelia coarctata (Turner ex Sm. & Sow.) M. Choisy - Thomson (1997: 621), Flock (2011: 27)

  679. Trapeliopsis granulosa (Hoffm.) Lumbsch - Thomson (1997: 624)

  680. Tremolecia atrata (Ach.) Hertel - Thomson (1997: 627), Flock (2011: 27)

    x

  681. Tuckermannopsis americana (Sprengel) Hale - Thomson (1984: 81 as Cetraria halei)
    x
  682. Tuckermannopsis chlorophylla (Willd.) Hale - Thomson (1984: 73 as Cetraria chlorophylla)

    x

  683. Tuckermannopsis ciliaris (Ach.) xxx - Howard (1958: 89 as Nephromopsis ciliaris)

    x

  684. Umbilicaria angulata Tuck. - Thomson (1984: 442), Flock (2011: 27)
  685. Umbilicaria arctica (Ach.) Nyl. - Thomson (1984: 444), Flock (2011: 27)
  686. Umbilicaria caroliniana Tuck. - Thomson (1984: 445)
  687. Umbilicaria cinereorufescens ( Schaer.) Frey - Thomson (1984: 446)
  688. Umbilicaria cylindrica (L.) Del. in Duby - Thomson (1984: 448), Flock (2011: 28)
    x
  689. Umbilicaria decussata (Vill.) xxx - Thomson (1984: 288 as Omphalodiscus decussatus)
  690. Umbilicaria deusta (L.) Baumg. - Thomson (1984: 449), Flock (2011: 28)
  691. Umbilicaria hirsuta (Sw.) Ach. - Thomson (1984: 452)
  692. Umbilicaria hyperborea (Ach.) Hoffm. - Howard (1958: 92), Thomson (1984: 453), Flock (2011: 28)
  693. Umbilicaria lyngei (Schol.) xxx - Thomson (1984: 28 as Agyrophora lyngei)
  694. Umbilicaria phaea Tuck. - Thomson (1984: 455)
    x
  695. Umbilicaria polaris xxx - Thomson (1984: 289 erroneously as Omphalodiscus krascheninnikovii)
  696. Umbilicaria polyphylla (L.) Baumg. - Thomson (1984: 457)
  697. Umbilicaria proboscidea (L.) Schrad. - Howard (1958: 92), Thomson (1984: 458), Flock (2011: 28)
  698. Umbilicaria rigida (DR.) xxx - Thomson (1984: 33 as Agyrophora rigida)
  699. Umbilicaria scholanderi (Llano) xxx - Thomson (1984: 33 as Agyrophora scholanderi)
  700. Umbilicaria torrefacta (Lightf.) Schrad. - Thomson (1984: 459), Flock (2011: 28)
  701. Umbilicaria vellea (L.) Ach. - Thomson (1984: 460), Flock (2011: 28)
    x
  702. Umbilicaria virginis (Schaer.) xxx - Thomson (1984: 290 as Omphalodiscus virginis)

    x

  703. Usnea cavernosa Tuck. - Thomson (1984: 463)
    x
  704. Usnea dasopoga (Ach.) Nyl. - Thomson (1984: 465 as Usnea dasypoga)
    x
  705. Usnea glabrata (Ach.) Vain. - Howard (1958: 92)
  706. Usnea subfloridana Stirt. - Thomson (1984: 469)
  707. Usnea substerilis Mot. - Thomson (1984: 470)

    x

  708. Vahliella globuligera (Fryday & P. M. Jørg.) xxx - xx (xx: xx as Fuscopannaria globuligera Type)

    x

  709. Varicellaria rhodocarpa (Körb.) Th. Fr. - Thomson (1997: 629)

  710. Verrucaria acrotella Ach. - Thomson (1997: 631)
  711. Verrucaria aethiobola Wahlenb. - Thomson (1997: 632)
  712. Verrucaria arctica Lynge - Thomson (1997: 633)
  713. Verrucaria cateleptoides (Nyl.) Nyl. - Thomson (1997: 634)
  714. Verrucaria ceuthocarpa Wahlenb. - Thomson (1997: 635)
  715. Verrucaria devergens Nyl. - Thomson (1997: 635), Flock (2011: 28)
  716. Verrucaria deversa Vain. - Thomson (1997: 637)
  717. Verrucaria integra (Nyl.) Nyl. - Thomson (1997: 638)
  718. Verrucaria margacea (Wahlenb. in Ach.) Wahlenb. - Thomson (1997: 639)
  719. Verrucaria maura Wahlenb. - Thomson (1997: 640)
  720. Verrucaria mucosa Wahlenb. - Thomson (1997: 641)
  721. Verrucaria muralis Ach. - Thomson (1997: 641)
  722. Verrucaria nigrescens Pers. - Thomson (1997: 642)
  723. Verrucaria praetermissa (Trevisan) Anzi - Thomson (1997: 643)
  724. Verrucaria rupestris Schrad. - Thomson (1997: 643)
  725. Verrucaria striatula Wahlenb. - Thomson (1997: 645)

  726. Vestergrenopsis elaeina (Wahlenb.) Gyeln. - Thomson (1984: 472)
  727. Vestergrenopsis isidiata (Degel.) Dahl - Thomson (1984: 473)

    x

  728. Vulpicida juniperina (L.) J.-E. Mattsson & M. J. Lai - Thomson (1984: 95 as Cetraria tilesii), Flock (2011: 28 as Vulpicida tilesii)
    x
  729. Vulpicida pinastri (Scop.) S. Gray - Howard (1958: 87 as Cetraria pinastri), Thomson (1984: 93 as Cetraria pinastri)
  730. Vulpicida tubulosus xxx - Howard (1958: 88 as )

    x

  731. Xanthomendoza fallax (Hepp) Söchting, Kärnefelt & S. Kondr. - Thomson (1984: 486 as Xanthoria fallax)
    x
  732. Xylographa opegraphella Nyl. ex Rothr. - Flock (2011: 28)
    x
  733. Xylographa parallela (Pers.) Zahlbr. - Thomson (1997: 646 as Xylographa abietina)
    x
  734. Xylographa vitiligo (Ach.) J. R. Laundon - Anderson (1967: 342), Thomson (1997: 647)