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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: 2. Pterygiopsis. Lichinaceae Nyl. (1854); Lichinales.

Taxonomic Literature: Henssen A., Symb. Bot. Upsal. 18: 1-123 [75-77] (1963); Henssen A. & Jørgensen P.M., Lichenologist 22: 137-147 (1990); Henssen A., Büdel B. & Wessels D., Mycotaxon 22: 169-195 (1985); Jørgensen P.M., Lichenologist 22: 213-217 (1990); Purvis O.W. in: Purvis O.W. et al. (eds), The Lichen Flora of Great Britain and Ireland, London (1992).

Biogeography: Checklist records: Great Britain, Italy, Sweden and Norway, and United States and Canada (continental).

Lichen Photobionts: Primary photobiont present; cyanobacterial. Primary photobiont taxonomy: Chroococcales, Cyanobacteria, Prokaryota. Secondary photobiont absent.

Thallus: Crustose or foliose, placodioid, granular, or areolate (primarily areolate), umbilicate. Upper Surface: Black; 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: Apothecioid, orbicular, forming all across the thallus surface, not emerging, becoming adnate to soon sessile. Margin: Indistinct. Exciple: White or brownish yellow. Periphyses: Absent. Epithecium: Apical cells olive. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed.

Ascospores: c. 8 per ascus, ellipsoid or broadly ellipsoid, 8-14 µm long, 6-9 µm wide, obtuse; septa absent; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

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