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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: basionymous or accepted. Taxonomic rank: genus. Number of known taxa within this rank: 30. Mycomicrothelia. Xanthopyreniaceae Zahlbr. (1926); Dothideales.

Taxonomic Literature: Aptroot A., Biblioth. Lichenol. 44: 1-178 (1991); Aptroot A., Diederich P., Sérusiaux E. & Sipman H.J.M., Biblioth. Lichenol. 64: 1-220 [111] (1997); Galloway D.J., Flora of New Zealand Lichens: i-lxxiii, 1-662 [298-299], Wellington (1985); Hawksworth D.L., Bull. Br. Mus. Nat. Hist., Bot. 14: 43-181 (1985); Hawksworth D.L. in: Purvis O.W. et al. (eds), The Lichen Flora of Great Britain and Ireland, London (1992).

Biogeography: Checklist records: Austria, Germany, Great Britain, Sonoran Desert, Italy, Sweden and Norway, New Zealand, United States and Canada (continental), Guianas, Thailand, and New Guinea.

Lichen Photobionts: Primary photobiont absent or present; trentepohlioid. Secondary photobiont absent.

Thallus: Indistinct or crustose, not subdivided parts. Thallus Outline: Soon disappearing or persistent. Upper Surface: Grey or brownish yellow; special structures absent. Lower Surface: Attached by the whole lower surface; special structures absent or present:; not pseudocyphellate; not cyphellate; not rhizinate; without thalloconidia thalloconidia; not cavernulate; not tomentose.

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, distinctly branched, distinctly anastomosed.

Ascospores: c. 8 per ascus, ellipsoid or oblong, 12.5-25 µm long, 5.5-10 µm wide, obtuse; septa present; transversally septate, 1-3-transversally septate; wall not thickened at the septum, dark brown, in Lugol's Solution negative, wall ornamented.

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