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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set not revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 1. Compsocladium. Biatoraceae A. Massal. ex Stiz. (1862); Lecanorineae; Lecanorales.

Lichen Photobionts: Primary photobiont present; chlorococcal. Secondary photobiont present. Secondary photobiont taxonomy: Scytonema, Scytonemataceae, Nostocales, Cyanobacteria, Prokaryota.

Thallus: Indistinct or crustose, not subdivided parts, subfruticose. Upper Surface: White, olive, or brownish yellow; special structures absent. Lower Surface: Attached by holdfasts; special structures absent.

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Apothecioid, orbicular, forming directly at the thallus margin, soon sessile or stipitate. Margin: Distinct to prominent; external filaments absent. Exciple: White. Periphyses: Absent. Epithecium: Apical cells black or green. Interascal Hyphae: Present, distinctly branched, distinctly anastomosed. Hypothecium: Brown.

Asci: Tholus thickened, amyloid, with non-amyloid narrow axial body and amyloid convergent flanks towards apex; dehiscence lecanoralean.

Ascospores: c. 8 per ascus, fusiform, 45-80-(100) µm long, 1.5-2-(3) µm wide, obtuse or aciculate; septa present; transversally septate, 5-8-(10)-transversally septate; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

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