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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: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 1. Placothelium. Verrucariaceae Zenker (1827); Verrucariales.

Taxonomic Literature: Müller J., Verh. K. K. Zool.-Bot. Ges. Wien 43: 295-300 (1893).

Lichen Photobionts: Primary photobiont present; cyanobacterial. Secondary photobiont absent.

Thallus: Crustose, not subdivided parts, squamulose. Upper Surface: Black or grey; 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: Perithecioid, orbicular, forming all across the thallus surface. Margin: External filaments absent. Periphyses: Absent. Interascal Hyphae: Present.

Ascospores: More than 32 per ascus, ellipsoid, 3-4 µm long, obtuse; septa absent; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

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