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Data Set Maintenance: Data set standard item. Data set author(s): Scholz P. Data set reviewer(s): Scholz P. (06-08-02); not revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: genus. Number of known taxa within this rank: 10-12. Synonyms: Buellia p. pt.; Physciaceae Zahlbr. (1898); Lecanorineae; Lecanorales.

Taxonomic Literature: Kalb, K., Biblioth. Lichenol. 88: 323-325 (2004); Marbach, B., Biblioth. Lichenol. 74: 323-327 (2000); Nordin, A., Lichenologist 36: 355-359 (2004); Nordin, A. & Tibell, L., Lichenologist 37: 491-498 (2005); Norman, J.M., Nytt Mag. Naturvidensk. 7: 236 (1853).

Biogeography: Checklist records: Austria, Germany, Sweden and Norway, and United States and Canada (continental).

Ecology: Saprobic or biotroph; lichenized or lichenicolous; terricolous, bryophytic, lignicolous, or corticolous.

Lichen Photobionts: Primary photobiont absent or present; chlorococcal. Primary photobiont taxonomy: Chlorococcales, Chlorophyceae, Eukariota. Secondary photobiont absent.

Thallus: Indistinct or crustose, granular. Thallus Outline: Persistent. Upper Surface: White or grey; special structures absent; not pseudocyphellate; eciliate; without hairs; not isidate; not sorediate; not cephalodiate; not lobulate; without granules granules, without thalloconidia thalloconidia. Lower Surface: Attached by the whole lower surface; special structures absent; not pseudocyphellate; not cyphellate; not rhizinate; without thalloconidia thalloconidia; not cavernulate.

Medulla: Iodine reaction not different with or without KOH pre-treatment (euamyloid).

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Apothecioid, orbicular, forming all across the thallus surface, becoming adnate to soon sessile. Wall: Not carbonized, not fused. Margin: Distinct; external filaments absent. Exciple: Black. Periphyses: Absent. Epithecium: Apical cells black or brown. Hymenium: Iodine reaction: Lugol’s positive, not hemiamyloid. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: Black.

Asci: Tholus thickened, amyloid, with non-amyloid narrow axial body and amyloid convergent flanks towards apex or with non-amyloid wide axial body and divergent amyloid flanks towards apex; ocular chamber broad; dehiscence lecanoralean; exoascus euamyloid, not hemiamyloid.

Ascospores: c. 8 per ascus, ellipsoid or fusiform, (13)-19-29-(32) µm long, (5)-7.5-11-(13) µm wide, obtuse or aciculate; septa present; transversally septate, 1-3-transversally septate, formed by the proper spore wall; wall thick, thickened at the septum, not constricted where the septum meets the spore wall, dark brown, in Lugol's Solution negative, wall not ornamented or ornamented.

Secondary Metabolites: Not detected or present, of the following substance class(es): ß-orcinol depsides (6-O-methylarthothelin in most species, some with atranorin).

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