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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Keller C. (98-07-10) and 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: 80. Thelidium. Synonyms: Involucrothelia Servít; Verrucariaceae Zenker (1827); Verrucariales.

Taxonomic Literature: Breuss O. in: Nash T.H. III et al. (eds) Lichen Flora of the Greater Sonoran Desert Region vol. 1, 481-482, Tempe (2002); Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero Special 7: 1-893 [734-741] (1985); Galloway D.J., Flora of New Zealand Lichens: i-lxxiii, 1-662 [570-571], Wellington (1985); Orange A., Lichenologist 23: 99-106 (1991); Orange A. in: Purvis O.W. et al. (eds), The Lichen Flora of Great Britain and Ireland, London (1992); Servít M., Ceskoslovenské Lisejníky celedi Verrucariaceae: 1-249, Praha (1954); Zschacke H., Rabenhorst's Kryptog. Fl. ed. 2, 9: 1-695 [326-410] (1934).

Biogeography: Checklist records: Australia, Austria, Germany, 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: Protococcus (A. Beck 22-05-97); genus incertae sedis; family of unknown placement (incertae sedis), Trebouxiophyceae, Eukariota. Secondary photobiont absent.

Thallus: Indistinct or crustose, not subdivided parts, rimose or areolate (primarily areolate). Upper Surface: Grey, brown, or brownish yellow; special structures absent or present:; not pseudocyphellate; eciliate; without hairs; not isidate; not sorediate or sorediate; not cephalodiate; not lobulate; without granules granules, without thalloconidia thalloconidia. 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: Indistinct to prominent; external filaments absent. Exciple: Brown or white. Periphyses: Present. Hymenium: Iodine reaction: Lugol’s negative, hemiamyloid. Interascal Hyphae: Absent. Hypothecium: Brown, white, or brownish yellow.

Asci: Tholus not amyloid; ocular chamber indistinct; dehiscence verrucarial; exoascus not amyloid, not hemiamyloid.

Ascospores: c. 8 per ascus, ellipsoid, oblong-obtuse, ovoid, or oblong, 9-61 µm long, 4-21 µm wide, obtuse; septa present; transversally septate (occasionally with 1-2 longitudinal septa), 1-3-(5)-transversally septate; wall thin or thick, distinctly differentiated into primary and secondary wall, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

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