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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Scholz P. (02-05-14); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 15. Cetrelia. Parmeliaceae Zenker (1827); Lecanorineae; Lecanorales.

Type Information: Type: Cetrelia cetrarioides (Delise ex Duby) W.L. Culb. & C.F. Culb.

Taxonomic Literature: Aptroot A., Diederich P., Sérusiaux E. & Sipman H.J.M.,
Biblioth. Lichenol. 64: 1-220 [48-49] (1997); Culberson W.L. &
Culberson, C.F., Contr. United States Nat. Herb. 34: 449-558 (1968);
Elix J.A., Bryologist 96: 359-383 (1993); Galloway D.J., Flora of New
Zealand Lichens: i-lxxiii, 1-662 [84], Wellington (1985); Purvis O.W.
in: Purvis O.W. et al. (eds), The Lichen Flora of Great Britain and
Ireland, London (1992); Ryan B.D. & Nash T.H. III in: Nash T.H.
III et al. (eds) Lichen Flora of the Graeter Sonoran Desert Region
vol. 1, 129-130, Tempe (2002).

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

Ecology: Biotroph; lichenized; lignicolous or corticolous; substrate rarely non-calciferous.

Lichen Photobionts: Primary photobiont present; chlorococcal. Primary photobiont taxonomy: Trebouxia (A. Beck 22-05-97); Trebouxiaceae; Trebouxiales, Trebouxiophyceae, Eukariota. Secondary photobiont absent.

Thallus: Foliose, not subdivided parts, lobed. Thallus Outline: Soon disappearing. Upper Surface: Grey; special structures present:; pseudocyphellate; eciliate; without hairs; not isidate or isidiate; not sorediate or sorediate; not cephalodiate; not lobulate; without granules granules, without thalloconidia thalloconidia. Lower Surface: Attached by holdfasts; special structures present:; not pseudocyphellate; not cyphellate; 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, soon sessile. Margin: Prominent; external filaments absent. Exciple: Grey or white. Periphyses: Absent. Epithecium: Apical cells brown or brownish yellow. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White.

Asci: Tholus thickened, amyloid, with non-amyloid wide axial body and divergent amyloid flanks towards apex; dehiscence lecanoralean.

Ascospores: c. 8 per ascus, ellipsoid, 11-22-(25) µm long, 6-12 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 along the thallus periphery.

Secondary Metabolites: Present, of the following substance class(es): orcinol depsides, orcinol depsidones, or ß-orcinol depsides.

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