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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; 02-06-22); revised; to be published after submission.

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

Taxonomic Literature: Taxonomic notes: Alstrup & Cole (1998) discribed Echinothecium aerophilum Alstrup
& M. Cole with 4 spored asci and dark brown ascospores of 27-32(-
37) x 7-9 µm. The species should be rechecked before included
in this genus. Alstrup, V. & Cole, M.S., Bryologist 101(2): 221-229 (1998); Etayo J., Biblioth. Lichenol. 84:1-154 [42] (2002); Keissler K. von, Rabenh. Kryptog.-Fl. 8: 1-712 [327-331] (1930); Navarro-Rosinés P., Gómez-Bolea A., Fol. Bot. Misc. 6: 61-64 (1989); Roux C. & Triebel D., Bull. Soc. Linn. Provençe 45: 451-542 [518-519] (1994); Triebel D., Biblioth.
Lichenol. 35: 1-278 [71-72] (1989).

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: Perithecioid, orbicular, soon sessile to substipitate. Margin: External filaments present. Exciple: Black or brown. Periphyses: Present. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Absent. Hypothecium: Black or brown.

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

Ascospores: c. 8 per ascus, ellipsoid or ovoid, 8-12 µm long, 3-5 µm wide, obtuse; septa present; transversally septate, 1-transversally septate; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

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