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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: 7. Thelomma. Caliciaceae Chevall. (1826); family of unknown placement (incertae sedis); Lecanorales.

Taxonomic Literature: Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero Special 7: 1-893 [743-744] (1985); Poelt J. & Vezda A., Biblioth. Lichenol. 16: 1-390 [328-329] (1981); Purvis O.W. in: Purvis O.W. et al. (eds), The Lichen Flora of Great Britain and Ireland, London (1992); Tibell L., Bot. Notiser 129: 221-249 (1976); Tibell L., Beih. Nova Hedwigia 79: 597-713 (1984).

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

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

Thallus: Crustose, granular, rimose, or areolate (primarily areolate). 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, not emerging. Margin: Indistinct. Periphyses: Absent. Hymenium: Mazaedioid. Hypothecium: Black or brown.

Ascospores: Ellipsoid, 13-28 µm long, 12-15 µm wide, obtuse; septa present; transversally septate or both transversally and longitudinally; wall thin, not thickened at the septum, dark brown, in Lugol's Solution negative, wall not ornamented.

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

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