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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Timdal E. (99-06-02) and Scholz P. (02-05-16); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 2. Psorinia. Lecanoraceae Körb. (1855); Lecanorineae; Lecanorales.

Taxonomic Literature: Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero
Special 7: 1-893 [646] (1985); Poelt J. & Vezda A., Biblioth.
Lichenol. 16: 1-390 [258] (1981); Schneider G., Biblioth. Lichenol.
13: 1-291 (1979); Timdal E. in: Nash T.H. III et al. (eds) Lichen Flora of the Greater Sonoran Desert Region vol. 1, 430-431, Tempe (2002).

Biogeography: Checklist records: Austria, Germany, Italy, Sonoran Desert, Sweden and Norway, and United States and Canada (continental).

Lichen Photobionts: Primary photobiont present; chlorococcal. Secondary photobiont absent.

Thallus: Crustose, squamulose or areolate (primarily areolate). Upper Surface: Grey, brown, olive, or brownish yellow; special structures present:; pseudocyphellate; eciliate; without hairs; not isidate; not sorediate; not cephalodiate; not lobulate; without granules granules, without thalloconidia thalloconidia. Lower Surface: Attached by holdfasts; special structures present:; not pseudocyphellate; not cyphellate; not rhizinate; without thalloconidia thalloconidia; not cavernulate; tomentose.

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Apothecioid, orbicular or irregular, forming all across the thallus surface, soon sessile. Margin: Indistinct to distinct; external filaments absent. Exciple: Green, white, olive, or brownish yellow. Periphyses: Absent. Epithecium: Apical cells green, brown, or olive. Hymenium: Iodine reaction: Lugol’s positive. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White or brownish yellow.

Asci: Tholus thickened, amyloid, with non-amyloid wide axial body and divergent amyloid flanks towards apex; ocular chamber broad; dehiscence lecanoralean; exoascus euamyloid.

Ascospores: c. 8 per ascus, ellipsoid, oblong-obtuse, or oblong, 9-16 µm long, 4-6 µm wide, obtuse; septa absent or present; transversally septate, 1-transversally septate, formed by the proper spore wall; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

Conidiomata: Absent resp. not observed or present; pycnidial; immersed, formed all accross the thallus surface.

Secondary Metabolites: Present, of the following substance class(es): ß-orcinol depsides and ß-orcinol depsidones.

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