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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Scholz P. (06-06-12); not revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 75 (estimation provided by A. Aptroot 99-09-27). Collema. Collemataceae Zenker (1827); Peltigerineae; Lecanorales.

Taxonomic Literature: Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero Special 7: 1-893 [339-345] (1985); Degelius G., Symb. Bot. Upsal. 13: 1-499 (1954); Degelius G., Symb. Bot. Upsal. 20: 1-215 (1974); Galloway D.J., Flora of New Zealand lichens: i-lxxiii, 1-662 [132-144], Wellington (1985); Kondratyuk S.Y.A. & Zelenko S.D., Ukrayins'k. Bot. Zhurn. 59(5): 598-607 (2002); Purvis O.W. in: Purvis O.W. et al. (eds), The Lichen Flora of Great Britain and Ireland, London (1992).

Biogeography: Checklist records: Austria, Germany, Great Britain, Guianas, Italy, New Guinea, New Zealand, Sonoran Desert, Sweden and Norway, Thailand, United States and Canada (continental), and Republic of South Africa.

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

Lichen Photobionts: Primary photobiont present; cyanobacterial. Primary photobiont taxonomy: Nostoc (A. Beck 22-05-97); Nostocaceae; Nostocales, Cyanobacteria, Prokaryota. Secondary photobiont absent.

Thallus: Crustose or foliose, not subdivided parts, granular, placodioid, or squamulose, lobed. Thallus Outline: Soon disappearing. Upper Surface: Black or brown; special structures absent or present:; not pseudocyphellate; eciliate; without hairs; not isidate or isidiate; not sorediate; not cephalodiate; not lobulate or lobulate; without granules granules, without thalloconidia thalloconidia. Lower Surface: Attached by holdfasts; special structures absent or present:; not pseudocyphellate; not cyphellate; not rhizinate or rhizinate; without thalloconidia thalloconidia; not cavernulate; not tomentose.

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: Distinct to prominent; external filaments absent. Exciple: White. Periphyses: Absent. Epithecium: Apical cells hyaline or brownish yellow. Interascal Hyphae: Present, scarcely branched to distinctly branched, not or scarcely anastomosed to distinctly anastomosed. Hypothecium: White.

Ascospores: 1–2 to 12-16 per ascus, ellipsoid, broadly ellipsoid, oblong-obtuse, oblong, cylindrical, fusiform, or allantoid, 13-95 µm long, 3-22 µm wide, obtuse; septa present; transversally septate or both transversally and longitudinally, 3-10-transversally septate; 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 or along the thallus periphery.

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