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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Lücking R. (95-08-01); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 25. Dimerella. Gyalectaceae (A. Massal.) Sitzenb. (1862); Gyalectales.

Taxonomic Literature: Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero Special 7: 1-893 [353-354] (1985); Galloway D.J., Flora of New Zealand Lichens: i-lxxiii, 1-662 [158-159], Wellington (1985); Harada H. & Vezda A., Bryologist 100: 454-457 (1997); Lücking R., Lichenologist 31(3): 269-289 (1999); Poelt J. & Vezda A., Biblioth. Lichenol. 9: 1-258 [97] (1977); Purvis O.W. & Coppins B.J. in: Purvis O.W. et al. (eds), The Lichen Flora of Great Britain and Ireland, London (1992); Santesson R., Symb. Bot. Upsal. 12: 1-590 [391-403] (1952).

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

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

Lichen Photobionts: Primary photobiont present; trentepohlioid. Primary photobiont taxonomy: Trentepohlia (A. Beck 22-05-97); Trentepohliaceae; Trentepohliales, Ulvophyceae, Eukariota. Secondary photobiont absent.

Thallus: Crustose, not subdivided parts, granular. Upper Surface: Grey; 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, soon sessile. Margin: Distinct to prominent; external filaments absent. Exciple: White. Periphyses: Absent. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White.

Ascospores: c. 8 per ascus, ellipsoid or fusiform, 6-25 µm long, 2-5 µm wide; septa present; transversally septate, 1-transversally septate; 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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