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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) and Scholz P. (07-07-24); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 11. Mazosia. Opegraphaceae Stizenb. (1862); Arthoniales.

Taxonomic Literature: Kalb K. & Vezda A., Folia Geobot. Phytotax. 23: 199-210 (1988); Lücking R., Lichenologist 31(3): 269-289 (1999); Lücking R., Cryptog. Mycol. 27: 121-147 (2006); Santesson R., Symb. Bot. Upsal. 12: 1-590 [108-129] (1952).

Biogeography: Checklist records: Bolivia, Guianas, New Guinea, New Zealand, Thailand, United States and Canada (continental), and Republic of South Africa.

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

Thallus: Crustose, not subdivided parts, granular. Upper Surface: Grey, green, olive, brownish yellow, or brown; 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, not emerging, becoming adnate. Margin: Prominent. Exciple: Black or brown. Periphyses: Absent. Interascal Hyphae: Present, distinctly branched, distinctly anastomosed.

Ascospores: c. 8 per ascus, ellipsoid, fusiform, or filiform, 12-60 µm long, 2-6 µm wide, obtuse or aciculate; septa present; transversally septate, (1)-3-7-transversally septate; wall thin or thick, distinctly differentiated into primary and secondary wall, not thickened at the septum, laterally constricted where the septum meets the spore wall (very slight), hyaline, in Lugol's Solution negative, wall not ornamented.

Conidiomata: Absent resp. not observed or present; pycnidial; immersed, formed all accross the thallus surface.

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