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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); revised; to be published after submission.

Nomenclature: Current taxonomic status: basionymous or accepted. Taxonomic rank: genus. Number of known taxa within this rank: 1. Orbicula. Genus of unknown placement (incertae sedis); Pezizales.

Type Information: Type: Orbicula cyclospora (Cooke) Cooke (= Sphaeria cyclospora Cooke = Orbicula parietina (Schrad.: Fr.) Hughes).

Taxonomic Literature: Dennis R.W.G., British Ascomycetes: 1-585 [382-383] (1978); Hughes S.J., Mycol. Pap. 42: 1-28 [1-20]; Massalongo A.B., Flora 38: 231-244, tab. III (1855) - sub Sphaeria variolariae A. Massal.; Matzer M., Cryptog. Mycol. 14: 11-19 [14] (1993); Matzer M. & Hafellner J., Biblioth. Lichenol. 37: 1-138 [112-113] (1990).

Ecology: Biotroph (on sclerotia of Sclerotinia sclerotiorum) or saprobic (on dung); fungicolous (on sclerotia of Sclerotinia sclerotiorum) or lichenicolous; terricolous, lignicolous, or corticolous.

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Perithecioid, orbicular, soon sessile. Wall: Not carbonized. Margin: External filaments absent. Exciple: Brown or violet. Interascal Hyphae: Present, scarcely branched to distinctly branched, distinctly anastomosed. Hypothecium: Brown or violet.

Ascospores: c. 8 per ascus, globose or ovoid, 6-13 µm long, 6-10 µm wide, obtuse; septa absent; wall thin or thick, distinctly differentiated into primary and secondary wall, not thickened at the septum, hyaline, pale brown, or dark brown, in Lugol's Solution negative, wall not ornamented.

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