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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. Tholurna. Caliciaceae Chevall. (1826); family of unknown placement (incertae sedis); Lecanorales.

Taxonomic Literature: Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero Special 7: 1-893 [746] (1985); Tibell L., Beih. Nova Hedwigia 79: 597-713 (1984).

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

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

Thallus: Crustose, not subdivided parts, squamulose or subfruticose. Upper Surface: Brown, grey, or olive; 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 directly at the thallus margin, soon sessile to stipitate. Margin: Distinct to prominent; external filaments absent. Exciple: Brown, white, or brownish yellow. Periphyses: Absent. Hymenium: Mazaedioid. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed.

Ascospores: c. 8 per ascus, ellipsoid, 15-21 µm long, 7-10 µm wide, obtuse; septa present; transversally septate, 1-transversally septate; wall not thickened at the septum, dark brown, in Lugol's Solution negative, wall ornamented.

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