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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: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 2. Karschia. Genus of unknown placement (incertae sedis); Dothideales.

Taxonomic Literature: Alstrup V. & Hawksworth D.L., Meddel. Grønland, Biosci. 31: 1-90 [40-41] (1990); Hafellner J., Beih. Nova Hedwigia 62: 1-248 [178-184] (1979); Santesson R., Thunbergia 21: 1-18 [7] (1994); Triebel D., Biblioth. Lichenol. 35: 1-278 [106-108] (1989); Triebel D., Rambold G. & Nash III T.H., Mycotaxon 42: 263-296 (1991).

Biogeography: Checklist records: Austria, Germany, Sonoran Desert, 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 or perithecioid, orbicular, not emerging, becoming adnate to substipitate, stromatic. Margin: Prominent; external filaments absent. Exciple: Black or brown. Periphyses: Absent. Epithecium: Apical cells brown or brownish yellow. Hymenium: Iodine reaction: Lugol’s negative or Lugol’s positive, not hemiamyloid or hemiamyloid. Interascal Hyphae: Present, distinctly branched, distinctly anastomosed. Hypothecium: Brown, white, or brownish yellow.

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

Ascospores: c. 4 to c. 8 per ascus, ellipsoid, 11-21 µm long, 4.5-10 µm wide, obtuse; septa present; transversally septate, 1-3-transversally septate; 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 or ornamented.

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