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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Scholz P. (02-05-15); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 1. Omphalora. Parmeliaceae Zenker (1827); Lecanorineae; Lecanorales.

Type Information: Type: Omphalora arizonica (Tuck. ex Willey) T.H. Nash & Hafellner.

Taxonomic Literature: Elix J.A., Bryologist 96: 359-383 (1993); Henssen A., Lichenologist
24: 27-41 (1992); Nash T.H. III & Ryan B.D. in: Nash T.H. III et al. (eds) Lichen Flora of the Greater Sonoran Desert Region vol. 1, 301-302, Tempe (2002); Nash T.H. III, Hafellner J. & Common R.S.,
Lichenologist 22: 355-365 (1990).

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

Thallus: Foliose, not subdivided parts, umbilicate or lobed. Upper Surface: Green or 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 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: Prominent; external filaments absent. Exciple: Grey or white. Periphyses: Absent. Epithecium: Apical cells brown or brownish yellow. 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, ellipsoid, 9-11 µm long, 5-6 µm wide, obtuse; septa absent; 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 depsidones or dibenzofurans [and usnic acids].

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