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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) and Triebel D. (98-01-01; 01-08-12); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 6. Clypeococcum. Genus of unknown placement (incertae sedis); Dothideales.

Taxonomic Literature: Galloway, D.J., Lichenology 51: 36-39 (2002); Grube M. & Hafellner J., Nova Hedwigia 51: 283-360 [337] (1990); Hafellner J., Herzogia 10: 1-28 [4-8] (1994); Hafellner J. in: Daniels F.J.A., Schulz M. & Peine J. (eds), Flechten Follmann: 421-429, Cologne (1995); Hafellner J., Mitt. Naturwiss. Ver. Steiermark 125: 73-88 (1996); Hawksworth D.L., Bot. J. Linn. Soc. 75: 195-209 (1977); Hawksworth D.L., Notes Roy. Bot. Gard. Edinburgh 38: 165-183 (1980); Hawksworth D.L., Notes Roy. Bot. Gard. Edinburgh 40: 375-397 (1982); Kocourková J., Acta Mus. Nat. Pragae, Ser. B., Hist. Nat. 55 (3-4): 59-169 [77-78] (2000); Navarro-Rosinés P., Roux C. & Llimona X., Bull. Soc. Linn. Provençe 45: 421-429 (1994); Øvstedal D.O. & Hawksworth D.L., Norsk. Polarinst. Skr. 185: 57-60 (1986); Triebel D., Biblioth. Lichenol. 35: 1-278 [64-67] (1989).

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

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

Medulla: Iodine reaction in Lugol's solution negative; 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: Perithecioid, orbicular or irregular, not emerging, becoming adnate, stromatic. Wall: With a carbonized black clypeus around the ostiole. Margin: External filaments absent. Exciple: Black or brown. Periphyses: Absent or present. Hymenium: Iodine reaction: Lugol’s negative or Lugol’s positive, not hemiamyloid. Interascal Hyphae: Present, scarcely branched to distinctly branched, not or scarcely anastomosed to distinctly anastomosed. Hypothecium: Black or brown.

Asci: Tholus thickened, not amyloid; dehiscence bitunicate; exoascus not amyloid, not hemiamyloid.

Ascospores: c. 4 to c. 8 per ascus, ellipsoid or ovoid, 8-22.5 µm long, 4-10 µm wide, obtuse or aciculate; septa present; transversally septate, 1-transversally septate; wall thin or thick, distinctly differentiated into primary and secondary wall, not thickened at the septum, laterally constricted where the septum meets the spore wall, dark brown, in Lugol's Solution negative, wall not ornamented or ornamented.

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