Lichenologist 19, 3: 226 (1987).
Protologue type data: Madeira: Entre Ribeiro Frio e Balcões. Sobre o ritidoma de Platanus, 27 July 1951, C. Tavares 4322 (LISU-holotype).
Type locality: Portugal, Madeira, between Ribeiro Frio and Balcões, sobre o ritidoma de Platanus, ? m, 27 July 1951, C. Tavares 4322 (LISU - holotype).
Type locality coordinates: 32°46'12"N, 16°51'25.2"W; 32.77, -16.857.
ITS barcode: Data lacking.
Description: Lichen. Thallus foliose, corticolous, to 11 cm diam., grey-brown to brown, lobes broad, 0.5-1.0-2.0 cm wide, often markedly coriaceous, closely adpressed, often + elongated, contiguous or + overlapping at the centre. Upper surface minutely scabrid (lens), smooth or faintly reticulate-sulcate, sulcae dispersed, soredia and isidia absent. Margins rarely entire, with numerous folioles. Lower surface dark brown-black, areolate-scabrid and obscurely ridged, in part naked or markedly spongy pubescent to tomentose. Medulla white. Photobiont Nostoc. Apothecia common, rounded ro reniform, disc red-brown-black, margins entire or rarely with folioles, with a + raised thalline cuff, dorsal surface conspicuously scabrid-areolate and ridged. Pycnidia frequent, + marginal, rarely laminal, on short projections. Anatomy: Thallus 250-275 µm thick. Upper cortex 36-45 µm thick, pseudoparenchymatous, + uneven, 3-6 cells thick, colourless to pale straw, lumens rounded, 4-7 µm diam. Lower cortex 40-45 µm thick, 3-4 cells thick; inner cells pale, lumens 8-11 x 4-6 µm; outer cells + red-brown, lumens rounded, 5-9 µm, extended into hairs c. 13 cells long; lower cells of hairs rounded with red-brown walls, 3-5 diam, upper cells + elongate, pale, 3.5-4 x 3 µm. Cortex above apothecia thick, uneven, 50-60 µm, c. 10 cells thick, cells colourless or pale straw, lumens 4-7 µm. Photobiont layer c. 45 µm thick, Nostoc cells violet-blue or cyanescent, 4-8 µm, closely compacted. Medulla 135-150 µm thick, compact, with interwoven hyphae c. 4.5 µm thick. Thecium 68-72 µm high; epithecium red-brown; paraphyses simple with apices + conglutinated with pigment; asci 45-48 x 14-17 µm. Spores pale to medium red-brown, ellipsoid, 3-septate, 18.5-22.7 x 6.8-7.3 µm. Conidia ellipsoid with rounded ends or rarely tapered at one end, 4.0-4.5 x 1.5-2.0 µm (James & White 1987: 226).
Photobiont: Data lacking.
Chemistry: Triterpenoids: hopane-6alpha,22-diol .... (James & White 1987: 229).
Ecology: Data lacking.
Distribution type: Endemic on Madeira (Madeira Islands, Portugal), but recorded from Tenerife in GBIF.
Taxonomy: Data lacking.
Note:
Distribution Database: Distributions
Distribution Database: Discover Life
Picture Database: Tropical Lichens
Molecular Database: Genbank
Synonym Database: Index Fungorum
Synonym Database: Mycobank