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Data Set Maintenance: Data set standard item. Data set author(s): Scholz P. @EXCL@ Cáceres M. (06-08-04). Data set not revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: genus. Number of known taxa within this rank: 21. Synonyms: Lethariicola Grummann (1969); Odontotremataceae D. Hawksw. & Sherwood (1982); Ostropales.

Taxonomic Literature: Diederich P., Zhurbenko M. & Etayo J., Lichenologist 34: 479-501 (2002); Nylander W., Mém. Soc. Imp. Sci. Nat. Cherbourg 5: 85-146 [143] (1858); Sherwood M.A., Mycotaxon 5: 1-277 [66-
68] (1977); Sherwood-Pike M.A., Mycotaxon 28: 137-177 [148-
165] (1987).

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

Ecology: Saprobic or biotroph; lichenicolous; lignicolous (or on coarse herbaceous stems).

Thallus: Indistinct. Upper Surface: Special structures absent; not pseudocyphellate; eciliate; without hairs; not isidate; not sorediate; not cephalodiate; not lobulate; without granules granules, without thalloconidia thalloconidia. Lower Surface: Special structures absent; not pseudocyphellate; not cyphellate; not rhizinate; without thalloconidia thalloconidia; not cavernulate; not tomentose.

Medulla: Iodine reaction in Lugol's solution negative; not different with or without KOH pre-treatment (euamyloid).

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Apothecioid or perithecioid, orbicular, becoming adnate. Wall: Not carbonized or carbonized around the ostiole, lacking a clypeus, not fused. Margin: Distinct; external filaments absent (exceptionally with few scattered, minuscule hair-like projections). Exciple: Black or brownish yellow. Periphyses: Present. Epithecium: Apical cells hyaline. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White, brownish yellow, or brown.

Asci: Tholus thickened, not amyloid; dehiscence unitunicate; exoascus not amyloid or euamyloid, not hemiamyloid.

Ascospores: c. 8 per ascus, ellipsoid, broadly ellipsoid, ovoid, or fusiform, (9)-12-20-(23.5) µm long, (3)-3.5-7-(8.7) µm wide, obtuse or aciculate; septa present; transversally septate (rarely submuriform), 1-3-8-(9)-transversally septate; wall thin, not thickened at the septum, not constricted where the septum meets the spore wall or laterally constricted where the septum meets the spore wall, hyaline, in Lugol's Solution negative, wall not ornamented.

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