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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: 9. Mycoblastus. Mycoblastaceae Hafellner (1984); Lecanorineae; Lecanorales.

Taxonomic Literature: Aptroot A., Diederich P., Sérusiaux E. & Sipman H.J.M., Biblioth. Lichenol. 64: 1-220 [111] (1997); Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero Special 7: 1-893 [523] (1985); Galloway D.J., Flora of New Zealand Lichens: i-lxxiii, 1-662 [297-298], Wellington (1985); Hafellner H., Beih. Nova Hedwigia 79: 241-371 [310-311] (1984); Poelt J. & Vezda A., Biblioth. Lichenol. 9: 1-258 [169-170] (1977); Schauer Th., Nova Hedwigia 8: 301-310 (1965); Tønsberg T., Sommerfeltia 14: 220-226 (1992); Watson M.F. & James P.W. in: Purvis O.W. et al. (eds), The Lichen Flora of Great Britain and Ireland, London (1992).

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

Ecology: Biotroph; lichenized; bryophytic, lignicolous, or corticolous; substrate non-calciferous.

Thallus: Crustose, not subdivided parts, granular. Thallus Outline: Soon disappearing or persistent. Upper Surface: Grey or white; special structures absent or present:; not pseudocyphellate; eciliate; without hairs; not isidate; not sorediate or sorediate; not cephalodiate; not lobulate; without granules granules, without thalloconidia thalloconidia. 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: Apothecioid, orbicular, forming all across the thallus surface, soon sessile. Margin: Indistinct to prominent; external filaments absent. Exciple: White, brownish yellow, or violet. Periphyses: Absent. Epithecium: Apical cells black, brown, green, brownish yellow, or olive. Interascal Hyphae: Present, scarcely branched, distinctly anastomosed. Hypothecium: White, brownish yellow, or violet.

Asci: Tholus thickened, amyloid, entirely amyloid throughout; dehiscence lecanoralean.

Ascospores: 1–2 to c. 4 per ascus, ellipsoid, oblong, or oblong-obtuse, 25-100 µm long, 15-45 µm wide, obtuse; septa absent; wall thick, distinctly differentiated into primary and secondary wall, 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.

Secondary Metabolites: Present, of the following substance class(es): orcinol depsides, ß-orcinol depsides, ß-orcinol depsidones, (higher) aliphatic acids, (anthra-)quinones, and dibenzofurans [and usnic acids].

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