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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 (A. Aptroot 99-09-27). Polysporina. Acarosporaceae Zahlbr. (1906); Acarosporineae; Lecanorales.

Taxonomic Literature: Galloway D.J., Flora of New Zealand. Lichens: 1-662 [411] (1985); Galloway D.J. & Coppins B.J. in: Purvis O.W., Coppins B.J., Hawksworth D.L., James P.W. & Moore D.M. (eds), The lichen flora of Great Britain and Ireland: 1-710 [487-488] (1992); Jørgensen P.M. & Santesson R., Taxon 42: 881-887 (1993); Poelt J. & Vezda A., Biblioth. Lichenol. 16: 1-390 [248-249] (1981); Rambold G. & Triebel D., Biblioth. Lichenol. 48: 1-201 [117] (1992); Vezda A., Folia Geobot. Phytotax. 13: 397-420 (1978); Triebel D., Rambold G. & Nash III T.H., Mycotaxon 42: 263-296 [284] (1991); Wirth V., Die Flechten Baden-Württembergs: 1-528 [383-384] (1987).

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

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

Lichen Photobionts: Primary photobiont absent or present; chlorococcal. Primary photobiont taxonomy: Myrmecia (A. Beck 22-05-97); Trebouxiaceae; Trebouxiales, Trebouxiophyceae, Eukariota. Secondary photobiont absent.

Thallus: Indistinct or crustose, not subdivided parts, rimose. Upper Surface: Grey or brownish yellow; special structures absent. Lower Surface: Attached by the whole lower surface; special structures absent.

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: Apothecioid, orbicular, forming all across the thallus surface, becoming adnate to soon sessile. Margin: Prominent; external filaments absent. Exciple: Black, brown, white, or brownish yellow. Periphyses: Absent. Epithecium: Apical cells black, brown, hyaline, or brownish yellow. Hymenium: Iodine reaction: Lugol’s positive, hemiamyloid. Interascal Hyphae: Present, distinctly branched, distinctly anastomosed. Hypothecium: White or brownish yellow.

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

Ascospores: More than 32 per ascus, ellipsoid, oblong, cylindrical, globose, or oblong-obtuse, 3-5.5 µm long, 1-3 µm wide, obtuse; septa absent; 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 or sessile, formed all accross the thallus surface.

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