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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Jørgensen P. M. (98-03-20); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 1. Muhria. Stereocaulaceae Chevall. (1826); Cladoniineae; Lecanorales.

Taxonomic Literature: Jørgensen P.M. & Jahns H.M., Notes Roy. Bot. Gard. Edinburgh 44: 581-599 (1987).

Lichen Photobionts: Primary photobiont present; chlorococcal and cyanobacterial. Primary photobiont taxonomy: Gloeocapsa, Stigonema, Trebouxia, and Microcystis; Chroococcaceae, Nostocaceae, Pleurocapsaceae, and Stigonemataceae. Secondary photobiont present.

Thallus: Crustose, rimose or areolate (primarily areolate). Upper Surface: Green, grey, or olive; special structures absent or present:; not pseudocyphellate; eciliate; without hairs; not isidate; not sorediate or sorediate; cephalodiate; not lobulate; without granules granules, without thalloconidia thalloconidia. 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, 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: Brown, white, or brownish yellow.

Ascospores: c. 8 per ascus, ellipsoid or oblong, 20-28 µm long, 6-8 µm wide, obtuse; septa present; transversally septate, 1-3-transversally septate; 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 all accross the thallus surface.

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

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