Checklist of lichens of Washington (USA)
Version 31 December 2017

 

  1. Acarospora americana H. Magn. - Eyerdam (1960: 107)
  2. Acarospora fuscata (Nyl.) Arnold - Douglas (1974: 584), Thomson (1997: 24)
  3. Acarospora schleicheri (Ach.) A. Massal. - Thomson (1997: 33)
  4. Acarospora elevata H. Magn. - Douglas (1974: 584 as Acarospora washingtonensis)

  5. Alectoria nigricans (Ach.) Nyl. - Douglas (1974: 584), Thomson (1984: 35)
  6. Alectoria ochroleuca (Hoffm.) A. Massal. - Douglas (1974: 584)
  7. Alectoria sarmentosa (Ach.) Ach. - Douglas (1974: 584)
  8. Alectoria vexillifera (Nyl.) Stizenb. - Thomson (1984: 38)

  9. Allantoparmelia alpicola (Th. Fr.) Essl. - Imshaug (1957 as Parmelia alpicola), Douglas (1974: 589 as Parmelia alpicola), Thomson (1984: 299 sub Parmelia alpicola)

  10. Amandinea punctata (Hoffm.) Coppins & Scheid. - Thomson (1997: 138 sub Buellia punctata)

  11. Amygdalaria panaeola (Ach.) Hertel & Brodo - Thomson (1997: 42)

  12. Arthonia radiata (Pers.) Ach. - Douglas (1974: 584)

  13. Arthothelium norvegicum Coppins & Tønsberg - Tønsberg & Williams (2006: 80 First record for North America)

  14. Aspicilia aliena (Zahlbr.) Oxner - Thomson (1997: 58)
  15. Aspicilia cinerea (L.) Körb. - Thomson (1997: 68)
  16. Aspicilia laevata (Ach.) Arnold - Herre (1943 as Lecanora laevata), Douglas (1974: 587 as Lecanora laevata)
  17. Aspicilia supertegens Arnold - Douglas (1974: 587 as Lecanora supertegens), Thomson (1997: 95)

  18. Athallia holocarpa (Hoffm.) Arup, Frödén & Søchting - Douglas (1974: 585 as Caloplaca holocarpa), Thomson (1997: 164 as Caloplaca holocarpa)
  19. Athallia scopularis (Nyl.) Arup, Frödén & Søchting - Thomson (1997: 168 as Caloplaca scopularis)

  20. Bacidia rubella (Hoffm.) A. Massal. - Thomson (1997: 107)

  21. Bactrospora cascadensis Ponzetti & McCune - Ponzetti & McCune (2006: 86 Type)

  22. Baeomyces rufus (Huds.) Rebent. - Douglas (1974: 584), Thomson (1984: 52)

  23. Bellemerea alpina (Sommerf.) Clauz. & Roux - Herre (1917: as Lecanora alpina), Douglas (1974: 587 as Lecanora alpina), Thomson (1997: 115)
  24. Bellemerea cinereorufescens (Ach.) Clauz. & Roux - Thomson (1997: 116)

  25. Biatora vernalis (L.) Fr. - Thomson (1997: 389 as Lecidea vernalis)

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

  27. Bilimbia lobulata (Sommerf.) Lynge - Thomson (1997: 617 as Toninia lobulata)
  28. Bilimbia sabuletorum (Schreb.) Arnold - Thomson (1997: 422 as Mycobilimbia sabuletorum)

  29. Blastenia ferruginea (Hudson) Th. Fr. - Douglas (1974: 584 as Caloplaca ferruginea)

  30. Brodoa oroarctica (Krog) Goward - Douglas (1974: 586 erroneously as Hypogymnia intestiniformis), Thomson (1984: 239 as Hypogymnia oroacrctica)

  31. Bryobilimbia hypnorum (Lib.) Fryday, Printzen & S. Ekman - Douglas (1974: 588 as Lecidea sanguineoatra), Thomson (1997: 351 as Lecidea hypnorum)

  32. Bryobilimbia hypnorum (Wulf.) Ach. -
  33. Bryonora castanea (Hepp) Poelt - Thomson (1997: 122)

  34. Bryoplaca jungermanniae (Vahl) Søchting, Frödén & Arup - Herre (1917: as Caloplaca jungermanniae), Douglas (1974: 585 as Caloplaca jungermanniae), Thomson (1997: 166 as Caloplaca jungermanniae)
  35. Bryoplaca tetraspora (Nyl.) Søchting, Frödén & Arup - Thomson (1997: 172 as Caloplaca tetraspora)

  36. Bryoria capillaris (Ach.) Brodo & D. Hawksw. - Thomson (1984: 55)
  37. Bryoria chalybeiformis (L.) Brodo & D. Hawksw. - Thomson (1984: 56)
  38. Bryoria fremontii Tuck. - Douglas (1974: 584 sub Alectoria fremontii)
  39. Bryoria fuscescens (Gyeln.) Brodo & D. Hawksw. - Douglas (1974: 584 sub Alectoria jubata), Thomson (1984: 57)
  40. Bryoria glabra (Mot.) Brodo & D. Hawksw. - Douglas (1974: 584 sub Alectoria glabra), Thomson (1984: 58)
  41. Bryoria lanestris (Ach.) Brodo & D. Hawksw. - Thomson (1984: 59)
  42. Bryoria pikei Brodo & D. Hawksw. - Eyerdam (1960: 107 as Alectoria cana)
  43. Bryoria pseudocapillaris Brodo & D. Hawksw. - Geiser et al. (2004: 105)
  44. Bryoria pseudofuscenscens (Gyeln.) Brodo & D. Hawksw. - Thomson (1984: 63)

  45. Buellia disciformis (Fr.) Mudd - Douglas (1974: 584), Thomson (1997: 129)
  46. Buellia epigaea (Pers.) Tuck. - Douglas (1974: 584)
  47. Buellia erubescens Arnold - Douglas (1974: 584 as Buellia zahlbruckneri)

  48. Calicium abietinum Pers. - Thomson (1997: 143)
  49. Calicium viride Pers. - Douglas (1974: 584), Thomson (1997: 146)

  50. Caloplaca atrosanguinea (Merr.) Lamb. - Douglas (1974: 584)
  51. Caloplaca cerina (Ehrh.) Th. Fr. - Douglas (1974: 584), Thomson (1997: 154)
  52. Caloplaca exsecuta (Nyl.) Dalla Torre & Sarnth. - Thomson (1997: 160)
  53. Caloplaca fraudans (Th. Fr.) Oliv. - Thomson (1997: 162)
  54. Caloplaca saxicola (Hoffm.) Nordin - Douglas (1974: 585 sub Caloplaca murorum)
  55. Caloplaca stillicidiorum (Vahl) Lynge - Douglas (1974: 585), Thomson (1997: 172)

  56. Calvitimela armeniaca (DC. in Lam. & DC.) Hertel & Rambold - Thomson (1997: 60 as Tephromela armeniaca)

  57. Candelariella aurella (Hoffm.) Zahlbr. - Herre (1917:), Douglas (1974: 585), Thomson (1997: 182)
  58. Candelariella citrina B. de Lesd. - Douglas (1974: 585 as Candelariella terrigena), Thomson (1997: 187 as Candelariella terrigena)
  59. Candelariella vitellina (Hoffm.) Müll. Arg. - Thomson (1997: 189)

  60. Catillaria glauconigrans (Tuck.) Hasse - Thomson (1997: 197)

  61. Catinaria atropurpurea (Schaer.) Vezda & Poelt - Thomson (1997: 201)

  62. Cetraria aculeata (Schreb.) Fr. - Imshaug (1957: ), Douglas (1974: 586 as Cornicularia aculeata), Thomson (1984: 198 as Cornicularia aculeata)
  63. Cetraria ericetorum Opiz subsp. ericetorum - Douglas (1974: 585), Thomson (1984: 79)
  64. Cetraria islandica (L.) Ach. - Herre (1917:), Howard (1950:), Imshaugh (1957:), Douglas (1974: 585), Thomson (1984: 84)
  65. Cetraria laevigata Rass. - Thomson (1984: 88)

  66. Cetrariella commixta(Nyl.) A. Thell & Kärnefelt - Imshaugh (1957: as Cetraria commixta), Douglas (1974: 585 as Cetraria commixta), Thomson (1984: 75 as Cetraria commixta)

  67. Cetrelia cetrarioides (Del. ex Duby) W. L. Culb. & C. F. Culb. - Eyerdam (1960: 109 as Parmelia cetrarioides), Culberson & Culberson (1968), Douglas (1974: 585), Thell et al. (1998: 309 DNA: ITS)

  68. Chaenotheca furfuracea (L.) Tibell - Eyerdam (1960: 108 as Coniocybe furfuracea), Thomson (1997: 210 as Coniocybe furfuracea)

  69. Circinaria caesiocinerea (Nyl. ex Malbr.) A. Nordin, Savić & Tibell - Douglas (1974: 587 as Lecanora caesiocinerea), Thomson (1997: 65 as Aspicilia caesiocinerea)
  70. Circinaria calcarea (L.) A. Nordin, Savic & Tibell - Herre (1943: as Lecanora calcarea), Howard (1950: as Lecanora calcarea), Douglas (1974: 587 as Lecanora calcarea)
  71. Circinaria contorta (Hoffm.) A. Nordin, Savic & Tibell - Eyerdam (1960: 108 as Lecanora contorta)
  72. Circinaria gibbosa H. Magn. - Herre (1917: as Lecanora gibbosula), Howard (1950: as Lecanora gibbosula), Douglas (1974: 587 as Lecanora gibbosula)

  73. Cladonia arbuscula (Wallr.) Flot. - Herre (1917: ), Douglas (1974: 585 sub Cladina arbuscula), Thomson (1984: 110)
  74. Cladonia asahinae J. W. Thomson - Thomson (1977: 361 Type in WIS), Ahti (1993: 67)
  75. Cladonia bellidiflora (Ach.) Schaer. - Herre (1917), Herre (1943: as Cladonia hookeri), Eyerdam (1960), Douglas (1974: 585), Douglas (1974: 586 as Cladonia hookeri), Thomson (1984: 113)
  76. Cladonia cariosa (Ach.) Spreng. - Howard (1950), Douglas (1974: 585), Thomson (1984: 116)
  77. Cladonia carneola (Fr.) Fr. - Douglas (1974: 585)
  78. Cladonia cenotea (Ach.) Schaer. - Thomson (1984: 118)
  79. Cladonia chlorophaea (Flörke ex. Sommerf.) Spreng. - Howard (1950), Eyerdam (1960: 107 as Cladonia chlorophaea f. simplex), Douglas (1974: 585), Thomson (1984: 119)
  80. Cladonia coccifera (L.) Willd. - Douglas (1974: 586), Thomson (1984: 121)
  81. Cladonia coniocraea (Flörke) Spreng. - Howard (1950), Eyerdam (1960: 107 as Cladonia coniocraea f. ceratodes, f. finkii, f. truncata), Douglas (1974: 586), Thomson (1984: 122)
  82. Cladonia cornuta (L.) Hoffm. subsp. cornuta - Eyerdam (1960: 108), Douglas (1974: 586), Thomson (1984: 124)
  83. Cladonia cryptochlorophaea Asah. - Thomson (1984: 126)
  84. Cladonia cyanipes (Somm.) Nyl. - Thomson (1984: 127)
  85. Cladonia deformis (L.) Hoffm. - Douglas (1974: 586)
  86. Cladonia digitata (L.) Hoffm. - Thomson (1984: 131)
  87. Cladonia ecmocyna Leight. subsp. ecmocyna - Douglas (1974: 586), Thomson (1984: 132)
  88. Cladonia fimbriata (L.) Fr. - Douglas (1974: 586), Thomson (1984: 133), Thomson (1984: 144 as Cladonia major)
  89. Cladonia floerkeana (Fr.) Flörke - Eyerdam (1960: 107), Douglas (1974: 586)
  90. Cladonia furcata (Huds.) Schrad. - Eyerdam (1960: ), Douglas (1974: 586)
  91. Cladonia gracilis (L.) Willd. subsp. turbinata (Ach.) Ahti - Thomson (1984: 136)
  92. Cladonia gracilis (L.) Willd. subsp. gracilis - Herre (1917: ), Eyerdam (1960: ), Douglas (1974: 586), Thomson (1984: 137)
  93. Cladonia grayi G. Merr. ex Sandst. - Thomson (1984: 139)
  94. Cladonia macilenta Hoffm. var. macilenta - Herre (1917: ), Eyerdam (1960: 108 as Cladonia macilenta f. granulosa and f. stryracella)
  95. Cladonia macilenta Hoffm. var. bacillaris (Ach.) Schaer. - Herre (1917: as Cladonia bacillaris), Douglas (1974: 585 as Cladonia bacillaris), Thomson (1984: 111 as Cladonia bacillaris)
  96. Cladonia macrophyllodes Nyl. - Thomson (1984: 143)
  97. Cladonia merochlorophaea Asah. - Thomson (1984: 143)
  98. Cladonia mitis Sandst. - Imshaugh (1957:), Douglas (1974: 585 sub Cladina mitis), Thomson (1984: 148)
  99. Cladonia multiformis G. Merr. - Douglas (1974: 586), Thomson (1984: 149)
  100. Cladonia ochrochlora Flörke - Eyerdam (1960: 108)
  101. Cladonia peziziformis (With.) J. R. Laundon - Eyerdam (1960 as Cladonia capitata), Douglas (1974: 585 as Cladonia capitata)
  102. Cladonia phyllophora Ehrh. ex Hoffm. - Eyerdam (1960: 108 as Cladonia degenerans f. phyllophora), Douglas (1974: 586), Thomson (1984: 153)
  103. Cladonia pyxidata (L.) Hoffm. - Herre (1917: ), Imshaug (1957: ), Eyerdam (1960: 108 as Cladonia pyxidata var. neglecta), Douglas (1974: 586), Thomson (1984: 158)
  104. Cladonia ramulosa (Ach.) Ahti & P. James - Eyerdam (1960: 108 as Cladonia pityrea f. cornuta, f. squamulifera and f. zwackhii), Douglas (1974: 586 as Cladonia pityrea), Thomson (1984: 109 as Cladonia anomaea)
  105. Cladonia rangiferina (L.) F. H. Wigg. - Herre (1917:), Douglas (1974: 585 sub Cladina rangiferina), Thomson (1984: 159)
  106. Cladonia squamosa (Scop.) Hoffm. var. squamosa - Herre (1917: ), Douglas (1974: 586), Thomson (1984: 161)
  107. Cladonia squamosa (Scop.) Hoffm. var. subsquamosa (Nyl. ex Leight.) Vain. - Howard (1950: as Cladonia subsquamosa), Douglas (1974: 586 as Cladonia subsquamosa)
  108. Cladonia stricta (Nyl.) Nyl. - Thomson (1984: 164)
  109. Cladonia subulata (L.) F. H. Wigg. - Eyerdam (1960: ), Eyerdam (1960: 108 as Cladonia cornutoradiata), Douglas (1974: 586), Thomson (1984: 168)
  110. Cladonia sulphurina (Michx.) Fr. - Douglas (1974: 586 as Cladonia gonecha)
  111. Cladonia trassii Ahti - Eyerdam (1960: 108 as Cladonia lepidota var. stricta f. pterophora), Douglas (1974: 586 as Cladonia lepidota)
  112. Cladonia turgida Ehrh. ex Hoffm. - Eyerdam (1960: 108), Thomson (1984: 172)
  113. Cladonia uncialis (L.) Weber ex F. H. Wigg. - Thomson (1984: 173)
  114. Cladonia verticillata (Hoffm.) Schaer. - Herre (1917: ), Douglas (1974: 586), Thomson (1984: 174)

  115. Collemopsidium sublitorale (Leight.) Grube & B. D. Ryan - Thomson (1997: 49 as Arthopyrenia sublitoralis)

  116. Cornicularia normoerica (Gunn.) Du Rietz - Imshaug (1957: ), Douglas (1974: 586), Thomson (1984: 201)

  117. Cyphelium inquinans (Sm. in Sm. & Sow.) Trevisan - Herre (1917: ), Douglas (1974: 586), Thomson (1997: 212)
  118. Cyphelium tigillare (Ach.) Ach. - Thomson (1997: 214)

  119. Dactylina arctica (Hook. f.) Nyl. - Imshaug (1957), Douglas (1974: 586), Thomson (1984: 203)

  120. Dermatocarpon luridum (Dill. ex With.) J. R. Laundon - Douglas (1974: 586 as Dermatocarpon fluviatile), Thomson (1984: 213 as Dermatocarpon fluviatile)
  121. Dermatocarpon intestiniforme (Körb.) Hasse - Thomson (1984: 216)
  122. Dermatocarpon meiophyllizum Vain. - Glavich & Geiser (2004: 139)
  123. Dermatocarpon miniatum (L.) W. Mann - Howard (1950), Douglas (1974: 586), Thomson (1984: 219)

  124. Dimelaena oreina (Ach.) Norman - Eyerdam (1960: 109 as Rinodina novomexicana)

  125. Diploschistes actinostomus (Ach.) Zahlbr. - Herre (1943), Douglas (1974: 586)
  126. Diploschistes muscorum (Scop.) R. Sant. subsp. muscorum - Thomson (1997: 218)
  127. Diploschistes scruposus (Schreb.) Norman - Douglas (1974: 586), Thomson (1997: 218)

  128. Diplotomma alboatrum (Hoffm.) Flot. - Douglas (1974: 584 as Buellia alboatra), Thomson (1997: 127 as Buellia alboatra)

  129. Erioderma sorediatum D. J. Galloway & P. M. Jørg. - Geiser et al. (2004: 106)

  130. Esslingeriana idahoensis (Essl.) Hale & M. J. Lai - Esslinger (1971: 366 as Cetraria idahoensis Type in DUKE), Douglas (1974: 585 as Cetraria idahoensis)

  131. Euopsis granatina (Sommerf.) Nyl. - Thomson (1997: 223)

  132. Evernia prunastri (L.) Ach. - Herre (1917: ), Howard (1950: ), Douglas (1974: 586)

  133. Fellhanera bouteillei (Desm.) Vezda - Douglas (1974: 585 sub Catillaria bouteilei)

  134. Flavocetraria cucullata (Bellardi) Kärnefelt & A. Thell - Imshaugh (1957 as Cetraria cucullata), Douglas (1974: 585 as Cetraria cucullata), Thomson (1984: 76 as Cetraria cucullata)
  135. Flavocetraria nivalis (L.) Kärnefelt & A. Thell - Imshaugh (1957: as Cetraria nivalis), Douglas (1974: 585 as Cetraria nivalis), Thomson (1984: 92 as Cetraria nivalis)

  136. Flavoplaca citrina (Hoffm.) Arup, Frödén & Søchting - Thomson (1997: 155 as Caloplaca citrina)

  137. Frutidella caesioatra (Schaer.) Kalb - Herre (1917: as Lecidea caesioatra), Howard (1950: as Lecidea caesioatra)

  138. Fuscopannaria cheiroloba (Müll. Arg.) P. M. Jørg. - Jørgensen et al. (2010: 2)
  139. Fuscopannaria cyanolepra (Tuck.) Herre - Herre (1917: as Parmeliella cyanolepra), Douglas (1974: 589 as Parmeliella cyanolepra)
  140. Fuscopannaria praetermissa (Nyl.) P. James - Howard (1950: as Parmeliella praetermissa), Douglas (1974: 589 as Parmeliella praetermissa)

  141. Graphis scripta (L.) Ach. - Howard (1950), Douglas (1974: 586)

  142. Gyalecta jenensis (Batsch) Zahlbr. - Thomson (1997: 241)

  143. Heppia lutosa (Ach.) Nyl. - Herre (1917: ), Douglas (1974: 586)

  144. Heterodermia leucomelos (L.) Poelt - Geiser et al. (2004: 106)

  145. Hydropunctaria maura (Wahlenb.) Keller, Gueidan & Thüs - Thomson (1997: 640 as Verrucaria maura)

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

  147. Hypogymnia amplexa Goward, Björk & Wheeler - Lumbsch et al. (2011: 64 Type in Vancouver, British Columbia, Canada UBC)
  148. Hypogymnia austerodes (Nyl.) Räsänen - Thomson (1984: 237)
  149. Hypogymnia enteromorpha (Ach.) Nyl. - Herre (1917: ), Douglas (1974: 586)
  150. Hypogymnia physodes (L.) Nyl. - Herre (1917: ), Douglas (1974: 587), Thomson (1984: 241)
  151. Hypogymnia vittata (Ach.) Parrique - Howard (1950), Douglas (1974: 587), Thomson (1984: 243)

  152. Icmadophila ericetorum (L.) Zahlbr. - Herre (1917: ), Howard (1950: ), Douglas (1974: 587), Thomson (1997: 249)

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

  154. Japewia tornoensis (Nyl.) Tønsberg - Douglas (1974: 588 as Lecidea tornoensis), Thomson (1997: 387 as Lecidea tornoensis)

  155. Kaernefeltia californica (Tuck.) A. Thell & Goward - Eyerdam (1960: 109 as Nephromopsis californica)

  156. Lecania dubitans (Nyl.) A. L. Sm. - Herre (1917: as Lecania dimera), Douglas (1974: 587 as Lecania dimera)
  157. Lecania franciscana (Tuck.) K. Knudsen & Lendemer - Eyerdam (1960: 107 as Catillaria franciscana)

  158. Lecanora allophana Nyl. - Herre (1917: as Lecanora subfusca), Douglas (1974: 587 as Lecanora subfusca)
  159. Lecanora cenisia Ach. - Douglas (1974: 587), Thomson (1997: 272)
  160. Lecanora chlarotera Nyl. - Thomson (1997: 273)
  161. Lecanora cinereofusca H. Magn. var. cinereofusca - Douglas (1974: 587)
  162. Lecanora circumborealis Brodo & Vitik. - Herre (1917: as Lecanora coilocarpa), Douglas (1974: 587 as Lecanora coilocarpa), Thomson (1997: 274)
  163. Lecanora dispersa (Pers.) Sommerf. - Thomson (1997: 278)
  164. Lecanora epibryon (Ach.) Ach. - Douglas (1974: 587)
  165. Lecanora expallens Ach. - Thomson (1997: 281)
  166. Lecanora frustulosa (Dicks.) Ach. - Herre (1917), Douglas (1974: 587)
  167. Lecanora fuscescens Somm. - Douglas (1974: 588 as Lecidea fuscescens)
  168. Lecanora hagenii (Ach.) Ach. - Herre (1917: ), Howard (1950: ), Douglas (1974: 587), Thomson (1997:286)
  169. Lecanora marginata (Schaer.) Hertel & Rambold- Herre (1943: as Lecidea marginata), Douglas (1974: 588 as Lecidea marginata), Thomson (1997: 291)
  170. Lecanora melaena (Hedl.) Fink - Eyerdam (1960: 108)
  171. Lecanora muralis (Schreb.) Rabenh. - Howard (1950: ), Eyerdam (1960: 108 as Lecanora diffracta), Douglas (1974: 587), Thomson (1997: 295)
  172. Lecanora orae-frigidae R. Sant. - Thomson (1997: 297)
  173. Lecanora pacifica Tuck. - Herre (1917: ), Douglas (1974: 587)
  174. Lecanora polytropa (Ehrh. in Hoffm.) Rabenh. - Herre (1917: ), Douglas (1974: 587), Thomson (1997: 299)
  175. Lecanora pulicaris (Pers.) Ach. - Thomson (1997: 301)
  176. Lecanora rupicola (L.) Zahlbr. - Douglas (1974: 587), Thomson (1997: 303)
  177. Lecanora strobilina (Sprengel) Kieffer - Eyerdam (1960: 108 as Lecanora conizaea)
  178. Lecanora subrugosa Nyl. - Thomson (1997: 308)
  179. Lecanora symmicta (Ach.) Ach. - Thomson (1997: 309)
  180. Lecanora umbrosa Degel. - Anderson (1974: 44)
  181. Lecanora varia (Hoffm.) Ach. - Herre (1917), Douglas (1974: 587), Thomson (1997: 311)
  182. Lecanora xylophila Hue - Thomson (1997: 284 as Lecanora grantii)

  183. Lecidea atrobrunnea (Ramond ex Lam. & DC.) Schaer. subsp. atrobrunnea - Douglas (1974: 587), Thomson (1997: 327)
  184. Lecidea auriculata Th. Fr. subsp. auriculata - Howard (1950: ), Douglas (1974: 587), Thomson (1997: 329)
  185. Lecidea cascadensis H. Magn. - Eyerdam (1960: 108)
  186. Lecidea cinerata Zahlbr. - Douglas (1974: 587)
  187. Lecidea confluens (W. A. Weber) Ach. - Douglas (1974: 587), Thomson (1997: 339)
  188. Lecidea furvonigrans (Tuck.) Zahlbr. - Douglas (1974: 588)
  189. Lecidea fuscoatra (L.) Ach. - Thomson (1997: 347)
  190. Lecidea lapicida (Ach.) Ach. - Howard (1950: ), Douglas (1974: 588), Thomson (1997: 357), Thomson (1997: 355 as Lecidea lactea)
  191. Lecidea leucothallina Arnold - Thomson (1997: 360)
  192. Lecidea lithophila (Ach.) Ach. - Thomson (1997: 362)
  193. Lecidea paddensis (Tuck.) Zahlbr. - Douglas (1974: 588)
  194. Lecidea paupercula Th. Fr. - Thomson (1997: 369)
  195. Lecidea plana Lahm ex Körb. - Douglas (1974: 588)
  196. Lecidea tessellata Flörke - Herre (1917: ), Howard (1950: ), Douglas (1974: 588), Thomson (1997: 384)

  197. Lecidella carpathica Körb. - Thomson (1997: 395)
  198. Lecidella elaeochroma (Ach.) M. Choisy - Herre (1943: ), Douglas (1974: 588), Thomson (1997: 396)
  199. Lecidella euphorea (Flörke) Hertel - Douglas (1974: 588 as Lecidea glomerulosa), Thomson (1997: 398)
  200. Lecidella stigmatea (Ach.) Hertel & Leuck. - Douglas (1974: 588), Thomson (1997: 402)
  201. Lecidella wulfenii (Hepp) Körb. - Thomson (1997: 403)

  202. Lecidoma demissum (Rutstr.) Gotth. Schneider & Hertel - Douglas (1974: 588 as Lecidea demissa), Thomson (1997: 405)

  203. Leioderma sorediatum D. J. Galloway & P. M. Jørg. - Geiser et al. (2004: 106)

  204. Lepraria albicans Th. Fr. - Douglas (1974: 591 as Stereocaulon albicans)
  205. Lepraria membranacea (Dicks.) Vain. - Douglas (1974: 588)
  206. Lepraria neglecta (Nyl.) Erichsen - Douglas (1974: 588)
  207. Lepraria subalbicans (I. M. Lamb) Lendemer & Hodkinson - Imshaug (1957: as Stereocaulon subalbicans), Douglas (1974: 591 as Stereocaulon subalbicans), Thomson (1984: 250 as Leprocaulon subalbicans)

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

  209. Leptogium brebissonii Mont. - Geiser et al. (2004: 107)
  210. Leptogium saturninum (Dicks.) Nyl. Thomson (1984: 262)

  211. Letharia vulpina (L.) Hue - Herre (1917: ), Douglas (1974: 588)

  212. Lobaria anomala (Brodo & Ahti) T. Sprib. & McCune - Merrill (Lich. Exs.: 25), Ahti et al. (1987: 95 Type in CANL), McCune et al. (2014: xx)
  213. Lobaria hallii (Tuck.) Zahlbr. - Thomson (1984: 266)
  214. Lobaria linita (Ach.) Rabenh. - Douglas (1974: 588), Thomson (1984: 269)
  215. Lobaria oregana (Tuck.) Müll. Arg. - Herre (1917: ), Howard (1950: ), Douglas (1974: 588)
  216. Lobaria pulmonaria (L.) Hoffm. - Herre (1917: ), Douglas (1974: 588)
  217. Lobaria scrobiculata (Scop.) DC. - Herre (1943: ), Douglas (1974: 588), Thomson (1984: 271)

  218. Lopadium pezizoideum (Ach.) Körb. - Thomson (1997: 411)

  219. Massalongia carnosa (Dicks.) Körb. - Herre (1917: ), Douglas (1974: 588), Thomson (1984: 274)

  220. Megaspora verrucosa (Ach.) Hafellner & V. Wirth - Thomson (1997: 443 as Pachyospora verrucosa)

  221. Melanelia hepatizon (Ach.) A. Thell - Imshaugh (1957: as Cetraria hepatizon), Douglas (1974: 585 as Cetraria hepatizon), Thomson (1984: 82 as Cetraria hepatizon)

  222. Melanelixia fuliginosa (Fr. ex Duby) O. Blanco, A. Crespo, Divakar, Essl., D. Hawksw. & Lumbsch - Eyerdam (1960: 109 as Parmelia fuliginosa)
  223. Melanelixia glabratula (Lamy) Sandler & Arup - Thomson (1984: 303 sub Parmelia glabratula)
  224. Melanelixia subaurifera (Nyl.) O. Blanco, A. Crespo, Divakar, Essl., D. Hawksw. & Lumbsch - Thomson (1984: 316 sub Parmelia subaurifera)

  225. Melanohalea elegantula (Zahlbr.) O. Blanco, A. Crespo, Divakar, Essl., D. Hawksw. & Lumbsch - Thomson (1984: 300 sub Parmelia elegantula)
  226. Melanohalea exasperata (De Not.) O. Blanco, A. Crespo, Divakar, Essl., D. Hawksw. & Lumbsch - Eyerdam (1960: 109 as Parmelia exasperata)
  227. Melanohalea exasperatula (Nyl.) O. Blanco, A. Crespo, Divakar, Essl., D. Hawksw. & Lumbsch - Thomson (1984: 300 sub Parmelia exasperatula)
  228. Melanohalea infumata (Nyl.) O. Blanco, A. Crespo, Divakar, Essl., D. Hawksw. & Lumbsch - Imshaug (1957: as Parmelia infumata), Douglas (1974: 589 as Parmelia infumata), Thomson (1984: 304 as Parmelia infumata)
  229. Melanohalea laciniatula (Flagey ex H. Olivier) O. Blanco, A. Crespo, Divakar, Essl., D. Hawksw. & Lumbsch - Eyerdam (1960: 109 as Parmelia laciniatula)
  230. Melanohalea multispora (A. Schneid.) O. Blanco, A. Crespo, Divakar, Essl., D. Hawksw. & Lumbsch - Howard (1950: as Parmelia multispora), Douglas (1974: 589 as Parmelia multispora)

  231. Menegazzia terebrata (Hoffm.) A. Massal. - Howard (1955: ), Douglas (1974: 588)

  232. Micarea denigrata (Fr.) Hedl. - Thomson (1997: 415)
  233. Micarea xanthonica Coppins & Tønsberg - Coppins & Tønsberg (2001: 93 Type in Bergen, Norway BG)

  234. Montanelia disjuncta (Erichsen) Divakar, A. Crespo, Wedin & Essl. - Eyerdam (1960: 109 as Parmelia disjuncta), Thomson (1984: 299 sub Parmelia disjuncta)
  235. Montanelia panniformis (Nyl.) Divakar, A. Crespo, Wedin & Essl. - Howard (1950: as Parmelia panniformis), Douglas (1974: 589 as Parmelia panniformis), Thomson (1984: 309 as Parmelia panniformis)
  236. Montanelia sorediata (Ach.) Divakar, A. Crespo, Wedin & Essl. - Thomson (1984: 312 sub Parmelia sorediosa)
  237. Montanelia tominii (Oxner) Divakar, A. Crespo, Wedin & Essl. - Thomson (1984: 317 sub Parmelia substygia)

  238. Mycobilimbia berengeriana (A. Massal.) Hafellner & V. Wirth - Douglas (1974: 587 as Lecidea berengeriana), Thomson (1997: 331 as Lecidea berengeriana)

  239. Mycoblastus affinis (Schaer.) Schauer- Thomson (1997: 424)
  240. Mycoblastus sanguinarius (L.) Norman - Douglas (1974: 588), Thomson (1997: 426)

  241. Myriospora smaragdula (Wahlenb. ex Ach.) K. Knudsen & B. Abbott - Thomson (1997: 34 as Acarospora smaragdula)

  242. Nephroma bellum (Spreng.) Tuck. - Wetmore (1960: ), Douglas (1974: 588), Thomson (1984: 278)
  243. Nephroma helveticum Ach. subsp. helveticum - Herre (1917: ), Douglas (1974: 588)
  244. Nephroma laevigatum Ach. - Herre (1917: ), Douglas (1974: 588)
  245. Nephroma parile (Ach.) Ach. - Wetmore (1960: ), Douglas (1974: 588), Thomson (1984: 282)
  246. Nephroma resupinatum (L.) Ach. - Wetmore (1960: ), Douglas (1974: 588), Thomson (1984: 283)

  247. Niebla cephalota (Tuck.) Rundel & Bowler - Geiser et al. (2004: 107)

  248. Nodobryoria abbreviata (Müll. Arg.) Common & Brodo - Cole & Hawksworth (2004: 1)
  249. Nodobryoria oregana (Tuck.) Common & Brodo - Douglas (1974: 584 sub Alectoria oregona)

  250. Ochrolechia androgyna (Hoffm.) Arnold - Douglas (1974: 589), Thomson (1997: 430)
  251. Ochrolechia inaequatula (Nyl.) Zahlbr. - Thomson (1997: 434)
  252. Ochrolechia oregonensis H. Magn. - Eyerdam (1960: 109), Douglas (1974: 589)
  253. Ochrolechia tartarea (L.) A. Massal. - Herre (1917: ), Howard (1970: ), Douglas (1974: 589)
  254. Ochrolechia upsaliensis (L.) A. Massal. - Douglas (1974: 589), Thomson (1997: 436)

  255. Opegrapha pulicaris (Hoffm.) Schrad. - Herre (1917: ), Douglas (1974: 589)

  256. Ophioparma lapponica (Räsänen) Hafellner & Rogers - Douglas (1974: 586 as Haematomma lapponicum), Thomson (1997: 440)

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

  258. Pannaria rubiginosa (Thunb.) Delise - Howard (1950: ), Douglas (1974: 589), Geiser et al. (2004: 107)

  259. Parmelia barrenoae Divakar, M. C. Molina & A. Crespo - Hodkinson et al. (2010: 3)
  260. Parmelia omphalodes (L.) Ach. - Thomson (1984: 308)
  261. Parmelia saxatilis (L.) Ach. - Howard (1950: ), Imshaug (1957), Douglas (1974: 589), Thomson (1984: 310)
  262. Parmelia sulcata Tayl. - Howard (1950: ), Douglas (1974: 589), Thomson (1984: 318)

  263. Parmeliella tryptophylla (Ach.) Müll. - Thomson (1984: 321)

  264. Parmeliopsis ambigua (Wulf.) Nyl. - Howard (1950: ), Douglas (1974: 589), Thomson (1984: 325)
  265. Parmeliopsis hyperopta (Ach.) Arnold - Herre (1943: ), Douglas (1974: 589), Thomson (1984: 326)

  266. Parmotrema perlatum (Huds.) M. Choisy - Herre (1917 as Parmelia perlata), Douglas (1974: 589 as Parmelia perlata)

  267. Peltigera aphthosa (L.) Willd. - Herre (1917: ), Thomson (1950: ), Howard (1950: ), Eyerdam (1960: ), Douglas (1974: 589), Thomson (1984: 329)
  268. Peltigera canina (L.) Willd. - Herre (1917: ), Howard (1950: ), Douglas (1974: 589)
  269. Peltigera collina (Ach.) Schrad. - Thomson (1950: ), Douglas (1974: 589), Thomson (1984: 334)
  270. Peltigera didactyla (With.) J. R. Laundon - Herre (1917: as Peltigera spuria), Thomson (1950: as Peltigera spuria), Douglas (1974: 589 as Peltigera spuria), Thomson (1984: 332 as Peltigera canina f. sorediata)
  271. Peltigera horizontalis (Huds.) Baumg. - Thomson (1984: 337)
  272. Peltigera lepidophora (Nyl. ex Vain.) Bitter - Imshaug (1950: ), Douglas (1974: 589), Thomson (1984: 338)
  273. Peltigera leucophlebia (Nyl.) Gyelnik - Eyerdam (1960: 109 as Peltigera aphthosa var. variolosa), Thomson (1984: 330 as Peltigera aphthosa var. leucophlebia)
  274. Peltigera malacea (Ach.) Funck - Howard (1950: ), Douglas (1974: 589), Thomson (1984: 339)
  275. Peltigera membranacea (Ach.) Nyl. - Howard (1950: ), Douglas (1974: 589), Thomson (1984: 340)
  276. Peltigera polydactylon (Neck.) Hoffm. - Herre (1917: ), Thomson (1950: ), Imshaug (1957: ), Douglas (1974: 589), Thomson (1984: 343)
  277. Peltigera rufescens (Weiss) Humb. - Thomson (1984: 333 as Peltigera canina var. rufescens)
  278. Peltigera scabrosa Th. Fr. - Thomson (1984: 344)
  279. Peltigera venosa (L.) Hoffm. - Herre (1917: ), Howard (1950), Douglas (1974: 589), Thomson (1984: 345)

  280. Pertusaria carneopallida (Nyl.) Anzi ex Nyl. - Thomson (1997: 451)
  281. Pertusaria glaucomela (Tuck.) Nyl. - Douglas (1974: 589)
  282. Pertusaria leioplaca DC. - Herre (1917: ), Douglas (1974: 589)
  283. Pertusaria sommerfeltii (Flörke ex Sommerf.) Fr. - Thomson (1997: 461)

  284. Phaeophyscia endococcina (Körb.) Moberg - Thomson (1984: 348)
  285. Phaeophyscia sciastra (Ach.) Moberg - Thomson (1984: 349)

  286. Physcia adscendens (Fr.) Oliv. - Thomson (1984: 352)
  287. Physcia aipolia (Humb.) Fürnr. var. aipolia - Herre (1917: ), Thomson (1963), Douglas (1974: 589), Thomson (1984: 353)
  288. Physcia caesia (Hoffm.) Hampe ex Fürnr. - Howard (1950: ), Douglas (1974: 589), Thomson (1984: 354)
  289. Physcia dubia (Hoffm.) Lettau - Imshaug (1957: ), Imshaug (1957: as Physcia teretiuscula), Thomson (1963: ), Thomson (1963: as Physcia teretiuscula), Douglas (1974: 590), Douglas (1974: 590 as Physcia teretiuscula), Thomson (1984: 355)
  290. Physcia magnussonii Frey - Esslinger (1979: 212 First record for North America)
  291. Physcia phaea (Tuck.) Thoms. - Thomson (1963: as Physcia cascadensis), Douglas (1974: 590 as Physcia cascadensis), Thomson (1984: 356)
  292. Physcia stellaris (L.) Nyl. - Howard (1950: ), Douglas (1974: 590)
  293. Physcia tenella (Scop.) DC. - Eyerdam (1960: 109)
  294. Physcia tribacia (Ach.) Nyl. - Howard (1950: ), Douglas (1974: 590)

  295. Physconia detersa (Nyl.) Poelt - Thomson (1984: 359)
  296. Physconia muscigena (Ach.) Poelt - Imshaug (1957: ), Thomson (1963: ), Douglas (1974: 590), Thomson (1984: 360)

  297. Pilophoron acicularis (Ach.) Th. Fr. - Eyerdam (1960: 109), Douglas (1974: 590)
  298. Pilophoron cereolus (Ach.) Th. Fr. in Hellbom - Herre (1917: ), Howard (1950: ), Howard (1955: ), Douglas (1974: 590)
  299. Pilophoron clavatus Th. Fr. - Herre (1917: ), Douglas (1974: 590)

  300. Placopsis gelida (L.) Lindsay - Thomson (1997: 472)

  301. Placynthiella uliginosa (Schrad.) Coppins & P. James - Thomson (1997: 475)

  302. Platismatia glauca (L.) W. L. Culb. & C. F. Culb. - Herre (1917: ), Howard (1950: ), Howard (1955), Douglas (1974: 590), Thomson (1984: 368)
  303. Platismatia herrei (Imshaug) W. L. Culb. & C. F. Culb. - Herre (1917: ), Howard (1950: ), Culberson & Culberson (1968: ), Douglas (1974: 590)
  304. Platismatia lacunosa (Ach.) W. L. Culb. & C. F. Culb. - Herre (1917: ), Douglas (1974: 590)
  305. Platismatia norvegica (Lynge) W. L. Culb. & C. F. Culb. - Douglas (1974: 590), Thell et al. (1998: 309 DNA: ITS)
  306. Platismatia stenophylla (Tuck.) W. L. Culb. & C. F. Culb. - Thell et al. (1998: 309 DNA: ITS)

  307. Placopsis gelida (L.) Linds. - Herre (1917: ), Douglas (1974: 590)

  308. Placynthiella uliginosa (Schrad.) Coppins & P. James - Douglas (1974: 588 as Lecidea uliginosa)

  309. Pleopsidium chlorophanum (Wahlenb. ex Ach.) Zopf - Magnusson (1956: 15 as Acarospora weldensis), Douglas (1974: 584 sub Acarospora chlorophana)
  310. Pleopsidium flavum (Bellardi) Körb. - Thomson (1997: 29 as Acarospora oxytona), Knudsen (2011: 83 as Pleopsidium stenosporum)

  311. Polycauliona candelaria (L.) Frödén, Arup, & Søchting - Herre (1943: as Xanthoria candelaria), Douglas (1974: 591 as Xanthoria candelaria), Thomson (1984: 483 as Xanthoria candelaria)
  312. Polycauliona polycarpa (Hoffm.) Frödén, Arup, & Søchting - Herre (1917: as Xanthoria polycarpa), Howard (1950: as Xanthoria polycarpa), Douglas (1974: 591 as Xanthoria polycarpa), Thomson (1984: 487 as Xanthoria polycarpa)

  313. Polychidium muscicola (Sw.) Gray - Thomson (1984: 370)

  314. Polysporina simplex (Taylor) Vezda - Howard (1950: as Sarcogyne simplex), Douglas (1974: 590 as Sarcogyne simplex), Thomson (1997: 486)
  315. Polysporina subfuscescens (Nyl.) K. Knudsen & Kocourk. - Eyerdam (1960: 109 as Sarcogyne bicolor), Douglas (1974: 590 as Sarcogyne bicolor)

  316. Porina radicicola P. M. McCarthy & Tønsberg - McCarthy & Tønsberg (1998: 245 Type in Bergen, Norway BG)

  317. Porpidia albocaerulescens (Wulf.) Hertel & Knoph - Howard (1950: as Lecidea albocaerulescens), Douglas (1974: 587 as Lecidea albocaerulescens)
  318. Porpidia crustulata (Ach.) Hertel & Knoph - Douglas (1974: 587 as Lecidea crustulata)
  319. Porpidia glaucophaea (Körb.) Hertel & Knoph - Douglas (1974: 588 as Lecidea glaucophaea)
  320. Porpidia grisea Gowan - Thomson (1997: 493)
  321. Porpidia macrocarpa (DC.) Steud. - Eyerdam (1960: as Lecidea macrocarpa), Eyerdam (1960: 109 as Lecidea platycarpa), Douglas (1974: 588 as Lecidea macrocarpa)
  322. Porpidia speirea (Ach.) Kremp. - Herre (1943: ), Douglas (1974: 588 as Lecidea speirea), Thomson (1997: 497)
  323. Porpidia thomsonii Gowan - Thomson (1997: 498)

  324. Protopannaria pezizoides (Web.) Trev. - Thomson (1984: 294 as Pannaria pezizoides)

  325. Protoparmelia badia (Hoffm.) Hafellner - Thomson (1997: 269 as Lecanora badia)

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

  327. Pseudephebe minuscula (Nyl. ex Arnold) Brodo & D. Hawksw. - Douglas (1974: 584 sub Alectoria minuscula), Thomson (1984: 373)
  328. Pseudephebe pubescens (L.) M. Choisy - Douglas (1974: 584 sub Alectoria pubescens), Thomson (1984: 374)

  329. Psora globifera (Ach.) A. Massal. - Howard (1950: as Lecidea globifera), Douglas (1974: 588 as Lecidea globifera), Thomson (1997: 508)
  330. Psora nipponica (Zahlbr.) Gotth. Schneider - Thomson (1997: 510)

  331. Psora rubiformis (Ach.) Hook. - Herre (1917: as Lecidea rubiformis), Douglas (1974: 588 as Lecidea rubiformis)
  332. Psoroma hypnorum (Vahl) Gray - Douglas (1974: 590), Thomson (1984: 375)

  333. Psorula rufonigra (Tuck.) Nyl. - Douglas (1974: 588 as Lecidea rufonigra)

  334. Pyrrhospora quernea (Dickson) Körb. - Geiser et al. (2004: 108)
  335. Ramalina farinacea (L.) Ach. - Douglas (1974: 590)
  336. Ramalina geniculata Hook. f. & Tayl. - Howard (1955), Douglas (1974: 590)
  337. Ramalina inflata Hook. f. & Tayl. subsp. inflata - Herre (1917:), Douglas (1974: 590)
  338. Ramalina pollinaria (Westr.) Ach. - Geiser et al. (2004: 109)
  339. Ramalina roesleri (Hoechst. ex Schaer.) (Hochst. ex Schaerer) Hue - Thomson (1984: 233 as Fisturiella roesleri)

  340. Ramboldia cinnabarina (Sommerf.) Kalb, Lumbsch & Elix - Thomson (1997: 336 as Lecidea cinnabarina)
  341. Ramboldia gowardiana (T. Sprib. & Hauck) Kalb, Lumbsch & Elix - Spribille & Hauck (2003: 560 as Pyrrhospora gowardiana)

  342. Rhizocarpon badioatrum (Flörke ex Sprengel) Th. Fr. - Thomson (1997: 524)
  343. Rhizocarpon bolanderi (Tuck.) Herre - Thomson (1997: 526)
  344. Rhizocarpon cinereovirens (Müll. Arg.) Vain. - Thomson (1997: 528)
  345. Rhizocarpon concentricum (Davis) Beltr. - Thomson (1997: 529)
  346. Rhizocarpon copelandii (Körb.) Th. Fr. - Thomson (1997: 531)
  347. Rhizocarpon disporum (Naeg. ex Hepp) Müll. Arg. - Herre (1917: ), Howard (1950: ), Douglas (1974: 590)
  348. Rhizocarpon distinctum Th. Fr. - Herre (1943: ), Douglas (1974: 590)
  349. Rhizocarpon geminatum Körb. - Thomson (1997: 537)
  350. Rhizocarpon geographicum (L.) DC. - Douglas (1974: 590), Thomson (1997: 538)
  351. Rhizocarpon grande (Flörke ex Flot.) Arnold - Thomson (1997: 539)
  352. Rhizocarpon hochstetteri (Körb.) Vain. - Herre (1943: ), Douglas (1974: 590), Thomson (1997: 540)
  353. Rhizocarpon jemtlandicum (Malme) Malme - Douglas (1974: 590), Thomson (1997: 542)
  354. Rhizocarpon macrosporum Räsänen - Douglas (1974: 590), Thomson (1997: 543)
  355. Rhizocarpon obscuratum (Ach.) A. Massal. - Douglas (1974: 590), Thomson (1997: 545)
  356. Rhizocarpon polycarpum (Hepp) Th. Fr. - Thomson (1997: 546)
  357. Rhizocarpon riparium Räsänen - Thomson (1997: 548)

  358. Rhizoplaca chrysoleuca (Sm.) Zopf - Douglas (1974: 587 as Lecanora chrysoleuca), Thomson (1997: 554)
  359. Rhizoplaca melanophthalma (Ram.) Leuck. & Poelt - Douglas (1974: 587 as Lecanora melanophthalma), Thomson (1997: 555)
  360. Rhizoplaca peltata (Ram.) Leuck. & Poelt - Thomson (1997: 555)

  361. Rinodina aurantiaca Sheard - Sheard & Mayrhofer (2002: 653)
  362. Rinodina conradii Körb. - Thomson (1997: 563)
  363. Rinodina exigua (Ach.) S. Gray - Herre (1917: ), Douglas (1974: 590)
  364. Rinodina hallii Tuck. - Herre (1917: ), Douglas (1974: 590)
  365. Rinodina marysvillensis H. Magn. - Magnusson (1932: 31 Type in Uppsala, Sweden UPS), Sheard (2010: 132)
  366. Rinodina mniaraea (Ach.) Körb. - Douglas (1974: 590), Thomson (1997: 567)
  367. Rinodina stictica Sheard & Tønsberg - Sheard & Tønsberg (1995: 41 Type in BG), Sheard (2010: 188)
  368. Rinodina turfacea (Wahlenb.) Körb. - Herre (1917: ), Douglas (1974: 590), Thomson (1997: 571)

  369. Romjularia lurida (Ach.) Timdal - Howard (1950: as Lecidea lurida), Douglas (1974: 588 as Lecidea lurida), Thomson (1997: 509 as Psora lurida)

  370. Rusavskia elegans (Link) S. Y. Kondr. & Kärnefelt - Herre (1917: as Xanthoria elegans), Howard (1950: as Xanthoria elegans), Douglas (1974: 591 as Xanthoria elegans), Thomson (1984: 484 as Xanthoria elegans)
  371. Rusavskia sorediata (Vain.) S. Y. Kondr. & Kärnefelt - Thomson (1984: 487 as Xanthoria sorediata)

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

  373. Sarcogyne mitziae K. Knudsen, Kocourk. & McCune - Knudsen et al. (2013: 122)

  374. Scoliciosporum umbrinum (Ach.) Arnold - Thomson (1997: 585)

  375. Scytinium lichenoides (L.) Otálora, P. M. Jørg. & Wedin - Howard (1950: as Leptogium lichenoides), Douglas (1974: 588 as Leptogium lichenoides), Thomson (1984: 257 as Leptogium lichenoides)
  376. Scytinium palmatum (Hudson) Otálora, P. M. Jørg. & Wedin - Thomson (1984: 260 as Leptogium palmatum)
  377. Scytinium rivale (Tuck.) Otálora, P. M. Jørg. & Wedin - Glavich & Geiser (2007: 8 as Leptogium rivale)
  378. Scytinium gelatinosum (Huds.) Mass. - Thomson (1984: 263 as Leptogium sinuatum)
  379. Scytinium subaridum P. M. Jørg. & Goward - Aragón et al. (2004: 165 as Leptogium subaridum)
  380. Scytinium subtile (Schrad.) Otálora, P. M. Jørg. & Wedin - Thomson (1984: 259 as Leptogium minutissimum)
  381. Scytinium tenuissimum (Dicks.) Fr. - Herre (1917: as Leptogium tenuissimum), Douglas (1974: 588 as Leptogium tenuissimum)

  382. Solorina crocea (L.) Ach. - Herre (1917: ), Howard (1950: ), Douglas (1974: 590), Thomson (1984: 387)
  383. Solorina saccata (L.) Ach. - Herre (1943: ), Douglas (1974: 590)

  384. Sphaerophorus fragilis (L.) Pers. - Eyerdam (1960: 109), Douglas (1974: 590), Thomson (1984: 392)
  385. Sphaeophorus globosus (Huds.) Vain. - Herre (1917: ), Howard (1950: ), Douglas (1974: 590)

  386. Sporastatia testudinea (Ach.) A. Massal. - Howard (1950: ), Douglas (1974: 584 as Biatorella kulshanensis), Douglas (1974: 590), Thomson (1997: 589)

  387. Staurothele areolata (Ach.) Lettau - Thomson (1997: 592)
  388. Staurothele drummondii (Tuck.) Tuck. - Howard (1950: as Staurothele clopima), Douglas (1974: 590 as Staurothele clopima), Douglas (1974: 591 as Staurothele perradiata), Thomson (1997: 595)
  389. Staurothele fissa (Tayler) Zwackh - Herre (1943: as Staurothele glacialis Typus?), Douglas (1974: 591 as Staurothele glacialis), Thomson (1997: 596)

  390. Stereocaulon alpinum Laurer ex Funck - Howard (1950: ), Imshaug (1957: ), Douglas (1974: 591), Thomson (1984: 400)
  391. Stereocaulon condensatum Hoffm. - Douglas (1974: 591)
  392. Stereocaulon depreaultii Delise ex Nyl. - Imshaug (1957: ), Douglas (1974: 591)
  393. Stereocaulon glareosum (Savicz) H. Magn. - Imshaug (1957: ), Douglas (1974: 591), Thomson (1984: 412)
  394. Stereocaulon grande (H. Magn.) H. Magn. - Thomson (1984: 413)
  395. Stereocaulon intermedium (Savicz) H. Magn. - Douglas (1974: 591), Thomson (1984: 417)
  396. Stereocaulon nivale (Follmann) Fryday - Follmann (xx: xx Type in ), Follmann & Huneck (1977: 176)
  397. Stereocaulon paschale (L.) Hoffm. - Herre (1917: ), Douglas (1974: 591), Thomson (1984: 418)
  398. Stereocaulon rivulorum H. Magn. - Douglas (1974: 591), Thomson (1984: 421)
  399. Stereocaulon saxatile H. Magn. - Thomson (1984: 423)
  400. Stereocaulon tomentosum E. Fries - Howard (1950: ), Douglas (1974: 591), Thomson (1984: 428)
  401. Stereocaulon vesuvianum Pers. - Howard (1950: ), Douglas (1974: 591)

  402. Strangospora moriformis (Ach.) Stein - Thomson (1997: 599)

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

  404. Tetramelas geophila (Flörke ex Sommerf.) Norman - Thomson (1997: 133 as Buellia geophila)
  405. Tetramelas papillatus (Sommerf.) Kalb - Douglas (1974: 584 as Buellia papillata), Thomson (1997: 136 as Buellia papillata)

  406. Thamnolia subuliformis (Ehrh.) W. L. Culb. - Douglas (1974: 591), Thomson (1984: 438)
  407. Thamnolia vermicularis (Sw.) Ach. ex Schaer. - Imshaug (1957: ), Douglas (1974: 591), Thomson (1984: 438)

  408. Thelomma ocellatum (Körb.) Tibell - Thomson (1997: 213 as Cyphelium ocellatum)

  409. Thelotrema lepadinum (Ach.) Ach. - Herre (1917: ), Douglas (1974: 591)

  410. Tholurna dissimilis (Norm.) Norm. - Otto (1972: ), Douglas (1974: 591)

  411. Toninia aromatica (Turner ex Sm.) A. Massal. - Herre (1943: ), Douglas (1974: 591), Thomson (1997: 613)
  412. Toninia ruginosa (Tuck.) Herre subsp. ruginosa - Howard (1950: ), Douglas (1974: 591)
  413. Toninia squalida (Schleicher ex Ach.) A. Massal. - Howard (1950: ), Douglas (1974: 591), Thomson (1997: 619)

  414. Trapelia coarctata (Turner ex Sm. & Sow.) M. Choisy - Eyerdam (1960: ), Douglas (1974: 591), Thomson (1997: 621)

  415. Trapeliopsis granulosa (Hoffm.) Lumbsch - Howard (1950: as Lecidea granulosa), Thomson (1997: 624)

  416. Tuckermannopsis chlorophylla (Willd.) Vain. - Herre (1917: as Cetraria chlorophylla), Douglas (1974: 585 as Cetraria chlorophylla), Thomson (1984: 73 as Cetraria chlorophylla)
  417. Tuckermannopsis ciliaris (Ach.) Gyeln. - Douglas (1974: 585 as Cetraria ciliaris)
  418. Tuckermannopsis platyphylla (Tuck.) Hale - Herre (1917 as Cetraria platyphylla), Douglas (1974: 585 as Cetraria platyphylla)
  419. Tuckermannopsis subalpina (Imshaug) Kärnefelt - Douglas (1974: 585 as Cetraria subalpina)

  420. Umbilicaria angulata Tuck. - Llano (1950: ), Imshaug (1957: ), Douglas (1974: 591), Thomson (1984: 442)
  421. Umbilicaria arctica (Ach.) Nyl. - Thomson (1984: 444)
  422. Umbilicaria cylindrica (L.) Del. in Duby - Herre (1917: ), Imshaug (1957: ), Douglas (1974: 591), Thomson (1984: 448)
  423. Umbilicaria decussata (Vill.) Zahlbr. - Imshaug (1950: as Omphalodiscus decussatus), Douglas (1974: 589 as Omphalodiscus decussatus), Thomson (1984: 288 as Omphalodiscus decussatus)
  424. Umbilicaria deusta (L.) Baumg. - Howard (1950: ), Imshaug (1957: ), Douglas (1974: 591), Thomson (1984: 449)
  425. Umbilicaria havaasii Llano - Imshaug (1957: ), Douglas (1974: 591), Thomson (1984: 451)
  426. Umbilicaria hyperborea (Ach.) Hoffm. var. hyperborea - Herre (1957: ), Llano (1950: ), Howard (1950: ), Imshaug (1957: ), Douglas (1974: 591), Thomson (1984: 453)
  427. Umbilicaria lambii Imshaug - Imshaug (1957: ) Typus ???
  428. Umbilicaria lyngei Schol. - Douglas (1974: 584 as Agyrophora lyngei), Thomson (1984: 30 as Agyrophora lyngei)
  429. Umbilicaria phaea Tuck. - Llano (1950: ), Douglas (1974: 591), Thomson (1984: 455)
  430. Umbilicaria polaris (Schol.) Zahlbr. - Thomson (1984: 289 erroneously as Omphalodiscus krascheninnikovii)
  431. Umbilicaria polyphylla (L.) Baumg. - Thomson (1984: 457)
  432. Umbilicaria polyrrhiza (L.) Fr. - Thomson (1984: 27 as Actinogyra polyrrhiza)
  433. Umbilicaria proboscidea (L.) Schrad. - Llano (1950: ), Imshaug (1957: ), Douglas (1974: 591), Thomson (1984: 458)
  434. Umbilicaria rigida (Du Rietz) Frey - Thomson (1984: 31 as Agyrophora rigida)
  435. Umbilicaria scholanderi (Llano) Krog - Thomson (1984: 32 as Agyrophora scholanderi)
  436. Umbilicaria torrefacta (Lightf.) Schrad. - Herre (1917: ), Llano (1950: ), Imshaug (1957: ), Douglas (1974: 591), Thomson (1984: 459)
  437. Umbilicaria vellea (L.) Ach. - Herre (1943: ), Llano (1950: ), Howard (1950: ), Douglas (1974: 591), Thomson (1984: 460)
  438. Umbilicaria virginis Schaerer - Imshaug (1957: as Omphalodiscus virginis), Douglas (1974: 589 as Omphalodiscus virginis), Thomson (1984: 290 as Omphalodiscus virginis)

  439. Usnea capillaris Mot. - Eyerdam (1960: 109)
  440. Usnea cavernosa Tuck. - Thomson (1984: 463)
  441. Usnea dasypoga (Ach.) Röhl. - Eyerdam (1960: 109 as Usnea dasypoga var. emena), Thomson (1984: 465)
  442. Usnea florida (L.) Weber ex F. H. Wigg. - Herre (1917: ), Douglas (1974: 591)
  443. Usnea glabrata (Ach.) Vain - Eyerdam (1960: 109)
  444. Usnea glabrescens (Nyl. ex Vain.) Vain. - Eyerdam (1960: 109), Eyerdam (1960: 109 as Usnea compacta), Douglas (1974: 591)
  445. Usnea hirta (L.) Weber ex F. H. Wigg. - Herre (1917: ), Howard (1955: ), Douglas (1974: 591), Thomson (1984: 467)
  446. Usnea longissima Ach. - Douglas (1974: 591)
  447. Usnea fragilescens var. mollis - Eyerdam (1960: 109 as Usnea mollis)
  448. Usnea scabrata Nyl. - Thomson (1984: 468 as Usnea scabrata subsp. nylanderiana)
  449. Usnea sphacelata R. Br. - Weber (1973: as Neuropogon lambii), Douglas (1974: 588 as Neuropogon lambii)
  450. Usnea subfloridana Stirt. - Eyerdam (1960: 109 as Usnea comosa), Thomson (1984: 469)
  451. Usnea subgracilis Vain. - Geiser et al. (2004: 108 as Usnea hesperina)
  452. Usnea substerilis Motyka - Eyerdam (1960: 110 as Usnea sorediifera), Eyerdam (1960: 110 as Usnea stuppea), Thomson (1984: 470)
  453. Usnea trichodea Ach. - Eyerdam (1960: 110), Douglas (1974: 591)

  454. Variolaria amara Ach. - Herre (1917: as Pertusaria amara), Douglas (1974: 589 as Pertusaria amara)

  455. Verrucaria acrotella Ach. - Douglas (1974: 591)
  456. Verrucaria ceuthocarpa Wahlenb. - Thomson (1997: 635)
  457. Verrucaria hydrela Ach. - Eyerdam (1960: 110), Douglas (1974: 591)
  458. Verrucaria margacea (Wahlenb. in Ach.) Wahlenb. - Thomson (1997: 639)
  459. Verrucaria nigrescens Pers. - Herre (1917: ), Douglas (1974: 591)

  460. Vulpicida pinastri (Scop.) J.-E. Mattsson & M. J. Lai - Imshaugh (1957: as Cetraria pinastri), Thomson (1984: 93 as Cetraria pinastri)
  461. Vulpicida tilesii (Ach.) J.-E. Mattsson & M. J. Lai - Glew (1994: 83)

  462. Wahlenbergiella mucosa (Wahlenb.) Gueidan & Thüs - Eyerdam (1960: 110 as Verrucaria mucosa), Thomson (1997: 641 as Verrucaria mucosa)
  463. Wahlenbergiella striatula (Wahlenb.) Gueidan & Thüs - Thomson (1997: 645 as Verrucaria striatula)

  464. Xanthocarpia tominii (Savicz) Frödén, Arup & Søchting - Thomson (1997: 173 as Caloplaca tominii)

  465. Xanthomendoza fallax (Hepp ex Arnold) Søchting, Kärnefelt & S. Y. Kondr. - Eyerdam (1960: 110 as Xanthoria fallax), Thomson (1984: 486 as Xanthoria fallax)

  466. Xanthoparmelia conspersa (Ehrh. ex Ach.) Hale - Howard (1950: ), Douglas (1974: 589 as Parmelia conspersa)

  467. Xylographa parallela (Ach.: Fr.) Behlen & Desberger - Thomson (1997: 646 as Xylographa abietina)
  468. Xylographa vitiligo (Ach.) J. R. Laundon - Thomson (1997: 647)

  469. Xylopsora friesii (Ach. in Lilj.) Bendiksby & Timdal - Thomson (1997: 247 as Hypocenomyce friesii)