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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: basionymous or accepted. Taxonomic rank: genus. Number of known taxa within this rank: 1. Pachyascus. Genus of unknown placement (incertae sedis); family of unknown placement (incertae sedis); Lecanorales.

Taxonomic Literature: Poelt J. & Hertel H., Ber. Deutsch. Bot. Ges. ser. 81: 210-216 (1968); Poelt J. & Döbbeler P., Bot. Jahrb. Syst. 96: 328-352 (1975).

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

Thallus: Indistinct or crustose, granular or leprose. Upper Surface: Green, grey, or olive; special structures absent or present:; not pseudocyphellate; eciliate; without hairs; not isidate; not sorediate; not cephalodiate; not lobulate; without granules or with granules granules, without thalloconidia thalloconidia. 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, soon sessile. Margin: Indistinct to distinct; external filaments absent. Exciple: White or brownish yellow. Periphyses: Absent. Epithecium: Apical cells hyaline or brownish yellow. Interascal Hyphae: Present, scarcely branched to distinctly branched, not or scarcely anastomosed to distinctly anastomosed. Hypothecium: White or brownish yellow.

Ascospores: c. 8 to 12-16 per ascus, ellipsoid, oblong, fusiform, or oblong-obtuse, 18-24 µm long, 4.5-6.5 µm wide, obtuse; septa present; transversally septate, 1-transversally septate; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

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