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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Matzer M. & Mayrhofer H. (95-01-15); revised; to be published after submission.

Nomenclature: Current taxonomic status: basionymous or accepted. Taxonomic rank: genus. Number of known taxa within this rank: 5 (A. Aptroot 99-09-27). Dimelaena. Physciaceae Zahlbr. (1898); Lecanorineae; Lecanorales.

Taxonomic Literature: Alstrup V. & Aptroot A., Cryptog. Bryol. Lichénol. 15: 205-209 (1994); Hafellner J., Mayrhofer H.& Poelt J., Herzogia 5: 39-79 (1979); Mayrhofer H., Beih. Nova Hedwigia 79: 511-536; Poelt J. & Vezda A., Biblioth. Lichenol. 9: 1-258 [93-95] (1977); Rambold G., Mayrhofer H. & Matzer M., Pl. Syst. Evol. 192: 31-40 (1994); Sheard J.W., Bryologist 77: 128-141 (1974); Sheard J.W., Bryologist 80: 100-118 (1977); Sheard J.W. & Mayrhofer H., Bryologist 87: 246-248 (1984); Steiner M. & Mayrhofer H., Nova Hedwigia 45: 315-326 (1987).

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

Lichen Photobionts: Primary photobiont present; chlorococcal. Secondary photobiont absent.

Thallus: Crustose, areolate (primarily areolate) or placodioid. Upper Surface: Brown, grey, brownish yellow, or 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, forming all across the thallus surface, not emerging, becoming adnate to soon sessile. Margin: Distinct to prominent; external filaments absent. Exciple: Brown, white, or brownish yellow. Periphyses: Absent. Epithecium: Apical cells brown. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: Brown, white, or brownish yellow.

Asci: Tholus thickened, amyloid, with non-amyloid narrow axial body and amyloid convergent flanks towards apex; dehiscence lecanoralean.

Ascospores: c. 8 per ascus, ellipsoid, 8-14.5 µm long, 4.5-8.5 µm wide, obtuse; septa present; transversally septate, 1-transversally septate; wall thin, not thickened at the septum or thickened at the septum, 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.

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

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