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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Lücking R. (95-08-01); revised; to be published after submission.

Nomenclature: Current taxonomic status: basionymous or accepted. Taxonomic rank: genus. Number of known taxa within this rank: 6 (A. Aptroot 99-09-27). Eremothecella. Arthoniaceae Reichenb. (1841); Arthoniales.

Taxonomic Literature: Aptroot A. & Sipman H.J.M., Willdenowia 20: 221-256 (1991) - sub Arthonia variratae; Santesson R., Symb. Bot. Upsal. 12: 1-590 [87-91] (1952) - sub Arthonia p.pte.; Sérusiaux E., Syst. Ascomycetum 11: 39-47 (1992).

Lichen Photobionts: Primary photobiont present; trentepohlioid. Secondary photobiont absent.

Thallus: Crustose, not subdivided parts. Upper Surface: Green or grey; special structures absent. Lower Surface: Attached by the whole lower surface; special structures absent.

Medulla: Iodine reaction reacting violet-red without and distinctly blue with KOH pre-treatment (hemiamyloid).

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, becoming adnate to soon sessile. Margin: External filaments absent. Epithecium: Apical cells brown or brownish yellow. Interascal Hyphae: Present, distinctly branched, distinctly anastomosed. Hypothecium: Brown or brownish yellow.

Ascospores: c. 8 per ascus, oblong or fusiform, 28-58 µm long, 7-14 µm wide, obtuse; septa present; transversally septate, 4-12-transversally septate; wall thin, not thickened at the septum, dark brown, middle brown, grey, or hyaline, in Lugol's Solution negative, wall not ornamented or ornamented.

Conidiomata: Present or absent resp. not observed; pycnidial; sessile, formed all accross the thallus surface.

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