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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Esslinger T. (99-11-15), Moberg R. (95-11-28), 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: 25. Physconia. Physciaceae Zahlbr. (1898); Lecanorineae; Lecanorales.

Taxonomic Literature: Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero
Special 7: 1-893 [600-605] (1985); Coppins B.J. in: Purvis O.W. et al. (eds), The Lichen Flora of Great Britain and Ireland, London (1992); Esslinger T.L. in: Nash T.H. III et al. (eds) Lichen Flora of the Greater Sonoran Desert Region vol. 1, Tempe (2002); Galloway D.J., Flora of New Zealand Lichens: i lxxiii, 1-662 [395-396], Wellington (1985); Hafellner J., Mayrhofer H., Poelt J., Herzogia 5: 39-79 (1979); Kashiwadani H., Ginkgoana 3: 1-77 (1975); Maas Geesteranus R.A., Blumea 7: 206-287 (1952); Moberg R., Symb. Bot. Upsal. 22: 1-108 (1977); Moberg R., Nord. J. Bot. 7: 719-728 (1987); Poelt J., Nova Hedwigia 9: 21-32 (1965); Poelt J., Nova Hedwigia 12: 107-135 (1966); Poelt J., Khumbu Himal 6: 57-100 (1974); Rambold G., Mayrhofer H. & Matzer M., Pl. Syst. Evol. 192: 31-40 (1994); Vitikainen O., Ann. Bot. Fenn. 5: 1-9 (1968).

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

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

Lichen Photobionts: Primary photobiont present; chlorococcal. Primary photobiont taxonomy: Trebouxia (A. Beck 22-05-97); Trebouxiaceae; Trebouxiales, Trebouxiophyceae, Eukariota. Secondary photobiont absent.

Thallus: Foliose, not subdivided parts, lobed. Thallus Outline: Soon disappearing. Upper Surface: Grey, brown, olive, or brownish yellow; special structures absent or present:; not pseudocyphellate; eciliate; without hairs or hairy; not isidate or isidiate; not sorediate or sorediate; not cephalodiate; not lobulate or lobulate; without granules granules, without thalloconidia thalloconidia. Lower Surface: Attached by holdfasts; special structures present:; not pseudocyphellate; not cyphellate; 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: Prominent; external filaments absent. Exciple: White. Periphyses: Absent. Epithecium: Apical cells brown. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White.

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

Ascospores: c. 8 per ascus, broadly ellipsoid or ellipsoid, (23)-23-32-(38) µm long, (12)-12-15-(21) µm wide, obtuse; septa present; transversally septate, 1-transversally septate; wall thin, thickened at the septum, dark brown, in Lugol's Solution negative, wall not ornamented or ornamented.

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

Conidiogeneous Cells: Intercalar. Conidia: Bacilliform (to short-cylindrical).

Secondary Metabolites: Not detected or present, of the following substance class(es): orcinol depsides, orcinol depsidones, and secalonic acids.

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