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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Tibell L. (98-02-23); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: genus. Number of known taxa within this rank: 20. Chaenotheca. Synonyms: Cybebe Tibell; Coniocybaceae Reichenb. (1828); of unknown placement (incertae sedis).

Taxonomic Literature: Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero Special 7: 1-893 [286-288] (1985); Galloway D.J., Flora of New Zealand Lichens: i-lxxiii, 1-662 [85-90], Wellington (1985); Middelborg J. & Mattsson J., Sommerfeltia 5: 1-71 (1987); Poelt J. & Vezda A., Biblioth. Lichenol. 16: 1-390 [135-139] (1981); Purvis O.W. & James P.W. in: Purvis O.W. et al. (eds), The Lichen Flora of Great Britain and Ireland, London (1992); Tibell L., Symb. Bot. Upsal. 23(1): 1-65 (1980); Tibell L., Beih. Nova Hedwigia 79: 597-713 (1984); Tibell L., Symb. Bot. Ups. 32(1): 291-322 [304-306] (1987).

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

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

Lichen Photobionts: Primary photobiont present; chlorococcal and trentepohlioid. Primary photobiont taxonomy: Dictyochloropsis, Nostoc, Stichococcus, Trebouxia, and Trentepohlia (A. Beck 19-05-97); Trentepohliaceae, genus incertae sedis, and Trebouxiaceae; Nostocales, Trentepohliales, Trebouxiales, family of unknown placement (incertae sedis), and Dictyochloropsis-group, Trebouxiophyceae and Ulvophyceae, Eukariota. Secondary photobiont absent.

Thallus: Indistinct or crustose, granular. Upper Surface: Brown, green, grey, brownish yellow, olive, 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, substipitate to stipitate. Margin: Distinct to prominent; external filaments absent. Hymenium: Mazaedioid. Interascal Hyphae: Present, distinctly branched, not or scarcely anastomosed.

Ascospores: Ellipsoid, broadly ellipsoid, oblong, globose, or oblong-obtuse, 2.5-9 µm long, 2.5-7.5 µm wide, obtuse; septa absent or present; transversally septate, 1-5-transversally septate; wall thin, not thickened at the septum, pale brown, in Lugol's Solution negative, wall not ornamented or ornamented.

Conidiomata: Absent resp. not observed or present; pycnidial or hyphomycetous; sessile (+ hyphomyceteous synanamorph), formed all accross the thallus surface.

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

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