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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: 3. Trimmatothele. Verrucariaceae Zenker (1827); Verrucariales.

Taxonomic Literature: Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero
Special 7: 1-893 [762] (1985); Coppins B.J. in: Purvis O.W. et al.
(eds), The Lichen Flora of Great Britain and Ireland, London (1992); Nash T.H. III in: Nash T.H. III et al. (eds) Lichen Flora of the Greater Sonoran Desert Region vol. 1, 504, Tempe (2002); Poelt J., Bestimmungsschlüssel Europäischer Flechten: 1-757
[673] (1969).

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

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

Thallus: Indistinct or crustose, rimose or areolate (primarily areolate). Upper Surface: Black or brown; 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, becoming adnate to soon sessile. Margin: Distinct to prominent; external filaments absent. Exciple: Black or brown. Periphyses: Present. Interascal Hyphae: Absent or present (or disappearing). Hypothecium: Black or brown.

Ascospores: More than 32 per ascus, ellipsoid, oblong-obtuse, or oblong, 2.5-9 µm long, 2-5 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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