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Data Set Maintenance: Data set standard item. Data set author(s): Triebel D. Data set reviewer(s): Triebel D. (98-01-01, 00-02-29; 00-06-12); revised; to be published after submission.

Nomenclature: Current taxonomic status: basionymous or accepted. Taxonomic rank: genus. Number of known taxa within this rank: 6. Pyrenidium. Dacampiaceae Körb. (1855); Dothideales.

Taxonomic Literature: Alstrup V. & Hawksworth D.L., Meddel. Grønland, Biosci. 31: 1-90 [56-59] (1990); Grube M. & Hafellner J., Nova Hedwigia 51: 283-360 [294, 350, 353] (1990); Hawksworth D.L., Trans. Brit. Mycol. Soc. 74: 363-386 (1980) - sub Dacampiosphaeria rivana; Hawksworth D.L., Notes Roy. Bot. Gard. Edinburgh 43: 497-519 (1986); Ihlen P.G., Lichenologist 30: 27-57 [50-52] (1998); Lücking R., Trop. Bryol. 15: 45-76 [64-65] (1998); Martínez Moreno M.I., Ruzia 15: 1-200 [174] (1999); Matzer M., Mycol. Pap. 171: 1-202 (1996); Molitor F. & Diederich P., Bull. Soc. Naturalistes Luxemb. 98: 69-92 [77] (1997); Navarro-Rosinés P., Els liquens i els fongs lichenicoles dels substrats carbonatats de Catalunya meridional. Tesis Doctoral ined., Univ. Barcelona: 1-459 [282-285] (1992); Triebel D., Biblioth. Lichenol. 35: 1-278 [67-70] (1989); Triebel D., Rambold G. & Nash II T.H., Mycotaxon 42: 263-296 [284-285] (1991).

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

Ecology: Biotroph; lichenicolous; terricolous, bryophytic, lignicolous, corticolous, or epiphyllous; 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, not emerging, becoming adnate to soon sessile. Margin: External filaments absent. Exciple: Black, green, or brown. Periphyses: Absent. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Present, scarcely branched to distinctly branched, distinctly anastomosed. Hypothecium: Brown.

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

Ascospores: 1–2 to c. 8 per ascus, ellipsoid, fusiform, or oblong, 9-49 µm long, 4-14 µm wide, obtuse or aciculate; septa present; transversally septate, 1-4-transversally septate, formed by the proper spore wall; 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, middle brown, hyaline, or pale brown, in Lugol's Solution negative, wall not ornamented.

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