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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set not revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 4. Psilolechia. Micareaceae Hafellner (1984); Cladoniineae; Lecanorales.

Taxonomic Literature: Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero Special 7: 1-893 [643] (1985); Coppins, B.J., Bull. Brit. Mus. (Nat. Hist.), Bot. 11: 17-214 (1983); Coppins B.J. & Purvis O.W., Lichenologist 19: 29-42 (1987); Poelt J. & Vezda A., Biblioth. Lichenol. 16: 1-390 [254] (1981); Purvis O.W. et al. (eds), The Lichen Flora of Great Britain and Ireland, London (1992); Rambold G., Biblioth. Lichenol. 34: 1-346 (1989).

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

Ecology: Biotroph; lichenized; terricolous, bryophytic, lignicolous, or corticolous; substrate non-calciferous.

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

Thallus: Indistinct or crustose, granular, leprose, or rimose. Upper Surface: Green, grey, brownish yellow, olive, white, or yellow; special structures absent or present:; not pseudocyphellate; eciliate; without hairs; not isidate; not sorediate; not cephalodiate; not lobulate; without granules or with granules granules, without thalloconidia thalloconidia. Lower Surface: Attached by the whole lower surface; special structures absent.

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

Ascospores: c. 8 per ascus, oblong-obtuse or ovoid, 3.5-7.2 µm long, 1.2-1.8 µm wide, obtuse or aciculate; septa absent or present; transversally septate, 1-1-transversally septate; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

Secondary Metabolites: Present, of the following substance class(es): orcinol depsides, (tri-)terpenoids, pulvinic acid derivatives, and dibenzofurans [and usnic acids].

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