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Data Set Maintenance: Data set standard item. Data set author(s): Triebel D. Data set reviewer(s): Scholz P. (06-06-12, 06-12-19) and Triebel D. (98-01-01; 00-03-08); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 14. Phacopsis. Parmeliaceae Zenker (1827); Lecanorineae; Lecanorales.

Taxonomic Literature: Aptroot A., Diederich P., Sérusiaux E. & Sipman H.J.M., Biblioth. Lichenol. 64: 1-220 [128-129] (1997); Etayo J.. Anales Jard. Bot. Madrid 60(1): 19-25 (2003); Etayo J. & Sancho L.G., Nova Hedwigia 83: 483-488 [485-487] (2006); Hafellner J., Herzogia 7: 343-352 (1987); Rambold G. & Triebel D., Biblioth. Lichenol. 48: 1-201 [114-116] (1992); Scholz P., Sauteria 9: 37-43 (1998); Triebel D. & Rambold G., Nova Hedwigia 47: 279-309 (1988); Triebel D., Rambold G. & Elix J.A., Bryologist 98: 71-83 (1995).

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

Ecology: Biotroph; lichenicolous; lignicolous or corticolous; substrate non-calciferous.

Medulla: Iodine reaction in Lugol's solution negative or in Lugol's solution positive; not different with or without KOH pre-treatment (euamyloid).

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Apothecioid, orbicular, irregular, or linear, not emerging, becoming adnate to soon sessile. Margin: Indistinct to prominent; external filaments absent. Exciple: White, black, brownish yellow, or brown. Periphyses: Absent. Epithecium: Apical cells hyaline, olive, brownish yellow, or brown. Hymenium: Iodine reaction: Lugol’s positive, not hemiamyloid. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White, black, or brown.

Asci: Tholus thickened, amyloid, with non-amyloid wide axial body and divergent amyloid flanks towards apex; dehiscence lecanoralean; exoascus euamyloid, not hemiamyloid.

Ascospores: c. 8 per ascus, ellipsoid, broadly ellipsoid, ovoid, oblong-obtuse, oblong, fusiform, reniform, or curved, 8-24.5 µm long, 3-8 µm wide, obtuse or aciculate; septa absent; wall thin or thick, distinctly differentiated into primary and secondary wall, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

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