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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. Raciborskiomyces. Pseudoperisporaceae Toro (1926); Dothideales.

Type Information: Type: Raciborskiomyces polonicus Siemaszko = R. longisetosus (Volkart) M.E. Barr.

Taxonomic Literature: Barr M.E., Mycotaxon 64: 149-171 (1997); Farr M.L., Mycologia 71: 243-271 [264-266] (1979) - sub Eudimeriolum volkartianum; Hawksworth D.L., Trans. Brit. Mycol. Soc. 74: 363-386 (1980) - sub Wentiomyces peltigericola; Kondratyuk S.Y., Muelleria 9: 93-104 [96, 101] (1996) - sub Wentiomyces tatjanae; Nüesch J., Phytopathol. Z. 39: 329-360 [354-357] (1960) - sub Epipolaeum longisetosum; Siemaszko W., Acta Soc. Bot. Poloniae 2: 269-274 (1925).

Ecology: Biotroph; lichenized or lichenicolous; terricolous, corticolous, or epiphyllous.

Thallus: Indistinct, filamentose. Upper Surface: Special structures absent. Lower Surface: Special structures absent.

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Perithecioid, orbicular, soon sessile. Wall: Not carbonized, not fused. Margin: Prominent; external filaments present. Exciple: Black or brown. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Absent or present. Hypothecium: Black or brown.

Asci: Tholus thickened, not amyloid or amyloid, with amyloid tube; ocular chamber broad; dehiscence bitunicate; exoascus not amyloid or euamyloid, not hemiamyloid.

Ascospores: c. 8 per ascus, ellipsoid or ovoid, 6-19 µm long, 1.5-7 µm wide, obtuse or aciculate; septa present; transversally septate, 1-transversally septate, formed by the proper spore wall; wall thin, not thickened at the septum, laterally constricted where the septum meets the spore wall, hyaline, pale brown, or dark brown, in Lugol's Solution negative, wall not ornamented.

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