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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: basionymous or accepted. Taxonomic rank: genus. Number of known taxa within this rank: 2. Cecidonia. Lecideaceae Chevall. (1826); Cladoniineae; Lecanorales.

Taxonomic Literature: Triebel D. & Rambold G., Nova Hedwigia 47: 279-309 (1988); Rambold G. & Triebel D., Biblioth. Lichenol. 48: 1-201 [105-106] (1992).

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

Thallus: Indistinct or crustose, not subdivided parts. Upper Surface: Grey, brownish yellow, or white; 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: Prominent; external filaments absent. Exciple: Black or brown. Periphyses: Absent. Epithecium: Apical cells brownish yellow or olive. Interascal Hyphae: Present, scarcely branched to distinctly branched, not or scarcely anastomosed to distinctly anastomosed. Hypothecium: Brown or brownish yellow.

Asci: Tholus thickened, amyloid, with amyloid tube or with amyloid cap; dehiscence lecanoralean.

Ascospores: c. 8 per ascus, ellipsoid or broadly ellipsoid, 9-16 µm long, 5-10 µm wide, obtuse; septa absent; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

Secondary Metabolites: Not detected or present, of the following substance class(es): orcinol depsides and ß-orcinol depsidones.

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