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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. (06-06-12); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 8. Asterothyrium. Asterothyriaceae W. Watson ex R. Sant. (1952); Ostropales.

Taxonomic Literature: Aptroot A., Diederich P., Sérusiaux E. & Sipman H.J.M., Biblioth. Lichenol. 64: 1-220 [20-21] (1997); Kalb K. & Vezda A., Nova Hedwigia 55: 195-209 (1992); Lücking R. & Kalb K., Bot. J. Linn. Soc. 139: 171-180 (2002); Santesson R., Symb. Bot. Upsal. 12: 1-590 [316-330] (1952).

Biogeography: Checklist records: Guianas, New Guinea, and United States and Canada (continental).

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

Thallus: Crustose, not subdivided parts. Thallus Outline: Soon disappearing or persistent. Upper Surface: White or grey; special structures absent. Lower Surface: Attached by the whole lower surface; special structures absent or present:; not pseudocyphellate; not cyphellate; not rhizinate; without thalloconidia thalloconidia; not cavernulate; not tomentose.

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 to soon sessile. Margin: Distinct to prominent. Exciple: White, brownish yellow, or brown. Periphyses: Absent. Epithecium: Apical cells hyaline or brownish yellow. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White or brownish yellow.

Ascospores: 1–2 to c. 8 per ascus, ellipsoid, oblong, fusiform, or allantoid, 8-90 µm long, 1.5-28 µm wide, obtuse; septa present; transversally septate or both transversally and longitudinally, 1-7-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, hyaline, in Lugol's Solution negative, wall not ornamented.

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

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