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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Jørgensen P. M. (98-03-20); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 40. Pyrenopsis. Pyrenopsidaceae Th. Fr. (1860); family of unknown placement (incertae sedis); Lecanorales.

Taxonomic Literature: Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero
Special 7: 1-893 [651-653] (1985); Coppins B.J., Gilbert O.L. &
Jørgensen P.M. in: Purvis O.W. et al. (eds), The Lichen Flora
of Great Britain and Ireland, London (1992); Henssen A., Büdel B
& Titze A., Botanica Acta 101: 49-55 (1987); Henssen A. &
Jørgensen P.M., Lichenologist 22: 137-147 (1990).

Biogeography: Checklist records: Austria, Germany, Great Britain, Italy, Sonoran Desert, Sweden and Norway, United States and Canada (continental), and Republic of South Africa.

Lichen Photobionts: Primary photobiont present; cyanobacterial. Primary photobiont taxonomy: Gloeocapsa (A. Beck 19-05-97); Chroococcaceae and Microcystaceae; Chroococcales, Cyanobacteria, Prokaryota. Secondary photobiont absent.

Thallus: Crustose, granular or rimose. Upper Surface: Black or brown; 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: Rarely apothecioid or perithecioid, orbicular, forming all across the thallus surface, becoming adnate or soon sessile. Margin: Prominent; external filaments absent. Exciple: White or brownish yellow. Periphyses: Absent. Epithecium: Apical cells brownish yellow. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White or brownish yellow.

Ascospores: c. 8 or more than 32 per ascus, globose, broadly ellipsoid, or ellipsoid, 4.5-18 µm long, 2-10 µm wide, obtuse; septa absent; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

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

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