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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Scholz P. (02-05-17, 06-06-13); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 5. Roccellaceae Chevall. (1826); Arthoniales.

Taxonomic Literature: Ertz D., Christnach C., Wedin M. & Diederich P., Biblioth. Lichenol. 91: 1-155 [138-143] (2005); Tehler A., Cryptog. Bot. 3: 139-151 (1993); Tehler A., Nova Hedwigia 57: 417-435 (1993); Tehler A. in: Nash T.H. III et al. (eds) Lichen Flora of the Greater Sonoran Desert Region vol. 1, 461-462, Tempe (2002).

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

Lichen Photobionts: Primary photobiont present; trentepohlioid. Primary photobiont taxonomy: Trentepohlia; Trentepohliaceae; Trentepohliales, Ulvophyceae, Eukariota. Secondary photobiont absent.

Thallus: Crustose, not subdivided parts, rimose. Upper Surface: White; special structures absent. 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: Prominent. Exciple: White. Epithecium: Apical cells brownish yellow or brown. Interascal Hyphae: Present, scarcely branched to distinctly branched, not or scarcely anastomosed to distinctly anastomosed. Hypothecium: Black or brown.

Ascospores: c. 8 per ascus, fusiform or curved, 13-27 µm long, 3-5 µm wide, obtuse or aciculate; septa present; transversally septate, 3-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 to sessile, formed all accross the thallus surface.

Secondary Metabolites: Present, of the following substance class(es): ß-orcinol depsides and ß-orcinol depsidones.

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