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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. Lettauia. Genus of unknown placement (incertae sedis); Leotiales.

Taxonomic Literature: Hawksworth D.L. & Santesson R., Biblioth. Lichenol. 38: 121-143 (1990); Ihlen P.G., Graphis Scripta 8: 33-39 (1997); Ihlen P.G. & Tønsberg T., Bryologist 99: 32-33 (1996); Rambold G. & Triebel D., Biblioth. Lichenol. 48: 1-201 [165] (1992).

Biogeography: Checklist records: Germany, Sweden and Norway, and United States and Canada (continental).

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: Apothecioid, orbicular, becoming adnate to soon sessile. Margin: Prominent; external filaments absent. Exciple: Brown, brownish yellow, or orange. Periphyses: Absent. Epithecium: Apical cells hyaline, brownish yellow, or orange. Hymenium: Iodine reaction: Lugol’s positive, not hemiamyloid. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White.

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

Ascospores: c. 8 per ascus, oblong, cylindrical, filiform, or fusiform, 12.5-31 µm long, 1.5-5 µm wide, obtuse or aciculate; septa present; transversally septate, (1)-2-3-transversally septate; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

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