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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Scholz P. (02-05-17); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 5. Thrombium. Thrombiaceae Poelt & Vezda ex J.C. David & D. Hawksw. (1991); Verrucariales.

Taxonomic Literature: Breuss O. in: Nash T.H. III et al. (eds) Lichen Flora of the Greater Sonoran Desert Region vol. 1, 483-484, Tempe (2002); Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero
Special 7: 1-893 [746] (1985); Galloway D.J., Flora of New Zealand
lichens: i-lxxiii, 1-662 [577-578], Wellington (1985); Purvis O.W.
in: Purvis O.W. et al. (eds), The Lichen Flora of Great Britain and
Ireland, London (1992).

Biogeography: Checklist records: Austria, Great Britain, Italy, New Zealand, Sonoran Desert, Sweden and Norway, and United States and Canada (continental).

Ecology: Biotroph; lichenized; terricolous; substrate non-calciferous or calciferous.

Lichen Photobionts: Primary photobiont present; chlorococcal. Primary photobiont taxonomy: Leptosira (A. Beck 22-05-97); genus incertae sedis; Leptosira-group, Trebouxiophyceae, Eukariota. Secondary photobiont absent.

Thallus: Indistinct or crustose, not subdivided parts, granular or areolate (primarily areolate). Upper Surface: Grey, green, brown, 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: Perithecioid, orbicular, forming all across the thallus surface, not emerging, soon sessile. Wall: Not fused. Margin: Distinct to prominent; external filaments absent. Exciple: Black or brown. Periphyses: Present. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed.

Ascospores: c. 8 per ascus, ellipsoid, clavate, or oblong, 8-30 µm long, 5-12 µm wide, obtuse; septa absent; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

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