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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: 80 (A. Aptroot 99-09-27). Polyblastia. Verrucariaceae Zenker (1827); Verrucariales.

Taxonomic Literature: Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - numero Special 7: 1-893 [614-623] (1985); Galloway D.J., Flora of New Zealand Lichens: i-lxxiii, 1-662 [410], Wellington (1985); Purvis O.W. & 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, Sonoran Desert, Italy, Sweden and Norway, New Zealand, United States and Canada (continental), and Thailand.

Ecology: Biotroph; lichenized; terricolous or corticolous; substrate non-calciferous or calciferous.

Lichen Photobionts: Primary photobiont present; chlorococcal. Primary photobiont taxonomy: Trochiscia (A. Beck 22-05-97); genus incertae sedis; family of unknown placement (incertae sedis), Chlorophyceae, Eukariota. Secondary photobiont absent.

Thallus: Indistinct or crustose, not subdivided parts, granular. Thallus Outline: Soon disappearing or persistent. Upper Surface: Black, brown, grey, olive, 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: Perithecioid, orbicular, forming all across the thallus surface, not emerging, becoming adnate to soon sessile. Margin: Indistinct; external filaments absent. Exciple: Black or brown. Periphyses: Present. Interascal Hyphae: Absent. Hypothecium: Black, brown, or brownish yellow.

Ascospores: 1–2 to c. 8 per ascus, ellipsoid, 12-135 µm long, 6-60 µm wide, obtuse; septa present; both transversally and longitudinally; wall thin or thick, distinctly differentiated into primary and secondary wall, not thickened at the septum, laterally constricted where the septum meets the spore wall, hyaline, pale brown, or dark brown, 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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