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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); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 3 (A. Aptroot 99-09-27). Pyrgillus. Synonyms: Pyrgillocarpon Nádv.; Pyrenulaceae Rabenh. (1870); Pyrenulales.

Taxonomic Literature: Aptroot A., Biblioth. Lichenol. 44: 1-178 (1991); Tibell L., Beih. Nova Hedwigia 79: 597-713 (1984).

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

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

Thallus: Indistinct or crustose, not subdivided parts. Upper Surface: Grey; 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: Orbicular, forming all across the thallus surface. Wall: With a carbonized black clypeus around the ostiole, not fused. Margin: External filaments absent. Exciple: Black or brown. Periphyses: Absent. Hymenium: Mazaedioid. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed.

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

Ascospores: c. 8 per ascus, ellipsoid or fusiform, 7-12 µm long, 5-8 µm wide, obtuse or aciculate; septa present; transversally septate, 1-(never 2)-3-transversally septate, formed by the endospore wall layer; wall thin, not thickened at the septum, dark brown, in Lugol's Solution negative, wall not ornamented.

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

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