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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. Thermutis. Lichinaceae Nyl. (1854); Lichinales.

Taxonomic Literature: Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero Special 7: 1-893 [745] (1985); Giavarini V. in: Purvis O.W. et al. (eds), The Lichen Flora of Great Britain and Ireland, London (1992); Henssen A., Symb. Bot. Upsal. 18: 1-123 [81-82] (1963).

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

Lichen Photobionts: Primary photobiont present; cyanobacterial. Primary photobiont taxonomy: Scytonema (A. Beck 19-05-97); Scytonemataceae; Nostocales, Cyanobacteria, Prokaryota. Secondary photobiont absent.

Thallus: Not subdivided parts, filamentose. Upper Surface: Black or brown; special structures absent. Lower Surface: Attached by holdfasts; special structures absent.

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Apothecioid, orbicular, forming all across the thallus surface, soon sessile. Margin: Prominent; external filaments absent. Periphyses: Absent. Epithecium: Apical cells brown. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White.

Ascospores: c. 8 to 12-16 per ascus, ellipsoid, 9-15 µm long, 5-8 µm wide, obtuse; septa absent; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

Conidiomata: Absent resp. not observed or present; pycnidial; formed all accross the thallus surface.

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