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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Elix J. A. (95-06-01); revised; to be published after submission.

Nomenclature: Current taxonomic status: basionymous or accepted. Taxonomic rank: genus. Number of known taxa within this rank: 2. Cetrariella. Parmeliaceae Zenker (1827); Lecanorineae; Lecanorales.

Type Information: Type: Cetrariella delisei (Bory ex Schaer.) Kärnefelt & A. Thell.

Taxonomic Literature: Kärnefelt I., Mattsson J.-E. & Thell A., Bryologist 96: 394-404 (1993).

Biogeography: Checklist records: Sweden and Norway and United States and Canada (continental).

Thallus: Fruticose, not subdivided parts. Upper Surface: Brown or brownish yellow; special structures absent or present:; not pseudocyphellate or pseudocyphellate; eciliate; without hairs; not isidate; not sorediate; not cephalodiate; not lobulate; without granules granules, without thalloconidia thalloconidia. Lower Surface: Attached by holdfasts; special structures absent.

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Apothecioid, orbicular, forming directly at the thallus margin, soon sessile. Margin: Prominent; external filaments absent. Exciple: White. Periphyses: Absent. Epithecium: Apical cells brown. 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, 5-10 µm long, 2.5-5 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; stipitate, formed along the thallus periphery.

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

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