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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Lücking R. (95-08-01); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 12. Calenia. Gomphillaceae W. Watson ex Hafellner (1984); Ostropales.

Taxonomic Literature: Lücking R., Lichenologist 31(3): 269-289 (1999); Santesson R., Symb. Bot. Upsal. 12: 1-590 [338-352] (1952); Vezda A., Folia Geobot. Phytotax. 14: 43-94 (1979); Vezda A. & Poelt J., Folia Geobot. Phytotax. 22: 179-198 (1987).

Thallus: Crustose, not subdivided parts, granular. Thallus Outline: Soon disappearing or persistent. Upper Surface: Green, grey, or white; special structures absent or present:; not pseudocyphellate; eciliate; without hairs or hairy; not isidate; not sorediate; not cephalodiate; not lobulate; without granules granules, without thalloconidia thalloconidia. 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 to soon sessile. Margin: Indistinct to prominent; external filaments absent. Exciple: White. Periphyses: Absent. Epithecium: Apical cells hyaline. Interascal Hyphae: Present, distinctly branched, distinctly anastomosed. Hypothecium: White.

Ascospores: 1–2 to c. 8 per ascus, ellipsoid, oblong, fusiform, oblong-obtuse, or ovoid, 8-50 µm long, 2.5-12 µm wide, obtuse; septa present; transversally septate or both transversally and longitudinally, 1-19-transversally septate; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

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