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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: 1. Tremolecia. Hymeneliaceae Körb. (1855); Acarosporineae; Lecanorales.

Taxonomic Literature: Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero Special 7: 1-893 [761] (1985); Galloway D.J., Flora of New Zealand Lichens: i-lxxiii, 1-662 [585-586], Wellington (1985); Hawksworth D.L. in: Purvis O.W. et al. (eds), The Lichen Flora of Great Britain and Ireland, London (1992); Hertel H., Khumbu Himal 6: 145-378 (1977); Poelt J. & Vezda A., Biblioth. Lichenol. 16: [335] (1981); Rambold G., Biblioth. Lichenol. 34: 1-346 (1989); Schwab A.J., Mitt. Bot. Staatssamml. München 22: 221-476 (1986).

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

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

Thallus: Crustose, rimose or areolate (primarily areolate). Thallus Outline: Soon disappearing or persistent. Upper Surface: Black, brownish yellow, or red; special structures absent. Lower Surface: Attached by the whole lower surface; special structures absent or present:; not pseudocyphellate; not cyphellate; not rhizinate; without thalloconidia thalloconidia; not cavernulate; not tomentose.

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. Margin: Distinct to prominent; external filaments absent. Exciple: Black or brown. Periphyses: Absent. Epithecium: Apical cells green, grey, or olive. Interascal Hyphae: Present, distinctly branched, not or scarcely anastomosed. Hypothecium: Black or brown.

Ascospores: c. 8 per ascus, ellipsoid, 10-15-(17) µm long, 6-9-(10) 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): ß-orcinol depsidones.

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