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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Schramm R. & Nash T.H. and Scholz P. (02-05-15); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 2. Koerberia. Synonyms: Tingiopsidium R.-G. Werner 1939; Placynthiaceae Dahl (1950); Peltigerineae; Lecanorales.

Taxonomic Literature: Henssen A., Can. J. Bot. 41: 1347-1357 (1963); Poelt J. & Vezda A., Biblioth. Lichenol. 9: 1-258 [131] (1977); Schoeninger R. in: Nash T.H. III et al. (eds) Lichen Flora of the Greater Sonoran Desert Region vol. 1, 259-260, Tempe (2002).

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

Lichen Photobionts: Primary photobiont present; cyanobacterial. Primary photobiont taxonomy: Scytonema; Scytonemataceae; Cyanobacteria, Prokaryota. Secondary photobiont absent.

Thallus: Crustose or foliose, not subdivided parts, placodioid, lobed. Thallus Outline: Soon disappearing. Upper Surface: Black; special structures absent or present:; not pseudocyphellate; eciliate; without hairs; not isidate or isidiate; not sorediate; not cephalodiate; not 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: Indistinct; external filaments absent. Exciple: White or brownish yellow. Periphyses: Absent. Epithecium: Apical cells brown or hyaline. Hymenium: Iodine reaction: Lugol’s positive. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White or brownish yellow.

Asci: Tholus thickened, not amyloid; dehiscence lecanoralean; exoascus not amyloid, not hemiamyloid.

Ascospores: c. 8 per ascus, filiform or fusiform, 10-45-(55) µm long, 1.5-4.5 µm wide, aciculate; septa absent or present; transversally septate, 0-1-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; formed all accross the thallus surface.

Conidiogeneous Cells: Apical or intercalar. Conidia: Bacilliform; not branched; aseptate.

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