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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; 00-06-12; 01-08-07); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 7. Rhagadostoma. Nitschkiaceae (Fitzp.) Nannf. (1932); Sordariales.

Type Information: Type: Rhagadostoma corrugatum Körb. (= Rhagadostoma lichenicola (De
Not.) Keissl.).

Taxonomic Literature: Taxonomic notes: We follow Navarro-Rosinés & Hladun (1994) who propose to
keep the genus Castagnella G. Arnaud as a separate genus for the
fungicolous species C. coccifera G. Arnaud. Müller E. & von Arx J.A., Beitr. Kryptogamenfl. Schweiz
11(2): 1-922 [603-605] (1962) - sub R. lichenicola; Hawksworth D.L.,
Trans. Brit. Mycol. Soc. 74: 363-386 (1980); Keissler K. von, Rabenh.
Kryptog.-Fl. 8: 1-712 [320-323] (1930); Martínez Moreno M.I.,
Ruzia 15: 1-200 [174-175] (1999); Navarro-Rosinés P., Els
liquens i els fongs lichenicoles dels substrats carbonatats de
Catalunya meridional. Tesis Doctoral ined., Univ. Barcelona: 1-459
[285-289] (1992); Navarro-Rosinés P. & Gómez-Bolea
A., Fol. Bot. Misc. 6: 61-64 (1989); Navarro-Rosinés P. &
Hladun N., Bull. Soc. Linn. Provençe 45: 431-442 (1994); Navarro-Rosinés P., Etayo J. & Calatayud V., Bull. Soc. Linn. Provence 50: 233-241 (1999); Vezda A., Ceská Mykol. 24: 220-229 (1970).

Biogeography: Checklist records: Austria, Great Britain, Italy, and Sweden and Norway.

Ecology: Biotroph; lichenicolous; terricolous; 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, stromatic. Margin: External filaments absent. Exciple: Black or brown. Periphyses: Present. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Absent or present, scarcely branched, not or scarcely anastomosed. Hypothecium: Black or brown.

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

Ascospores: 1–2 to c. 8 per ascus, broadly ellipsoid, ellipsoid, fusiform, cylindrical, ovoid, oblong, or curved, 10-60 µm long, 4-15.5 µm wide, obtuse or aciculate; septa absent or present; transversally septate, 1-3-transversally septate; wall thin, not thickened at the septum, hyaline or pale brown, in Lugol's Solution negative, wall not ornamented.

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