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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: 3. Pleopsidium. Candelariaceae Hakul. (1954); Lecanorineae; Lecanorales.

Biogeography: Checklist records: Austria, Germany, Sonoran Desert, Italy, Sweden and Norway, United States and Canada (continental), and Bolivia.

Thallus: Crustose, areolate (primarily areolate) or placodioid. Upper Surface: Yellow; 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, becoming adnate to soon sessile. Margin: Distinct to prominent; external filaments absent. Exciple: White. Periphyses: Absent. Epithecium: Apical cells yellow. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White.

Ascospores: More than 32 per ascus, ellipsoid, 5-6-(6.5) µm long, 2-2.3-(3) 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 all accross the thallus surface.

Secondary Metabolites: Present, of the following substance class(es): (higher) aliphatic acids and pulvinic acid derivatives.

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