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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set not revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 8. Mycoglaena. Genus of unknown placement (incertae sedis); Dothideales.

Taxonomic Literature: Coppins B.J. in: Purvis O.W. et al. (eds), The Lichen Flora of Great Britain and Ireland, London (1992); Harris R.C., A taxonomic revision of the genus Arthopyrenia A. Massal. s. lat. (Ascomycetes) in North America. - Ph. D. diss., Michigan State Univ., East Lansing (1975).

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

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Perithecioid, orbicular, forming all across the thallus surface, soon sessile. Margin: External filaments absent. Periphyses: Absent. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed.

Ascospores: c. 8 per ascus, clavate, fusiform, or ovoid, 16-38 µm long, 4.5-10 µm wide, obtuse; septa present; transversally septate or both transversally and longitudinally, 3-10-transversally septate; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

Conidiomata: Absent resp. not observed or present; pycnidial; immersed, formed all accross the thallus surface.

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