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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: 100. Acarospora. Acarosporaceae Zahlbr. (1906); Acarosporineae; Lecanorales.

Taxonomic Literature: Clauzade G. & Roux C., Bull. Mus. Hist. Nat. Marseille 41: 41-93
(1981); Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest, N.S.
7: 1-893 [125-152] (1985); Galloway D.J., Flora of New Zealand.
Lichens: 1-662 [1-2] (1985); Poelt J. & Vezda A., Biblioth.
Lichenol. 9: 1-258 [3-7] (1977); Purvis O.W. & James P.W. 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 [58-
63] (1992); Rambold G. & Triebel D., Biblioth. Lichenol. 48: 89-
91 (1992).

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

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

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

Thallus: Crustose, not subdivided parts, squamulose, rimose, or areolate (primarily areolate). Upper Surface: Yellow, brown, red, white, or brownish yellow; special structures absent. Lower Surface: Attached by the whole lower surface; special structures absent.

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Apothecioid, orbicular or irregular, forming all across the thallus surface, not emerging, becoming adnate to soon sessile. Margin: Indistinct to prominent; external filaments absent. Exciple: Grey or white. Periphyses: Absent. Epithecium: Apical cells brown. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: Grey or white.

Ascospores: More than 32 per ascus, globose, broadly ellipsoid, or ellipsoid, 3-13 µm long, 1-6 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, formed all accross the thallus surface.

Secondary Metabolites: Not detected or present, of the following substance class(es): orcinol depsides, ß-orcinol depsides, and pulvinic acid derivatives.

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