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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Aptroot A. (95-02-10) and Lücking R. (95-08-01, 05-02-18); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 40. Astrothelium. Trypetheliaceae Zenker (1927); Pyrenulales.

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

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

Thallus: Crustose, not subdivided parts. Thallus Outline: Soon disappearing or persistent. Upper Surface: White, green, or yellow; 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: Perithecioid, orbicular, forming all across the thallus surface, not emerging, stromatic. Wall: Carbonized only in parts, not fused. Margin: Indistinct; external filaments absent. Periphyses: Absent. Interascal Hyphae: Present, distinctly branched, distinctly anastomosed.

Asci: Tholus thickened, not amyloid; ocular chamber broad; dehiscence bitunicate.

Ascospores: c. 8 per ascus, ellipsoid, oblong, or cylindrical, 20-150 µm long, 7-25 µm wide, obtuse; septa present; transversally septate, 3-25-transversally septate, formed by the endospore wall layer; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

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

Secondary Metabolites: Not detected or present, of the following substance class(es): (anthra-)quinones and xanthones.

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