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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: basionymous or accepted. Taxonomic rank: genus. Number of known taxa within this rank: 1. Xerotrema. Odontotremataceae D. Hawksw. & Sherwood (1982); Ostropales.

Taxonomic Literature: Hawksworth D.L. in: Purvis O.W. et al. (eds), The Lichen Flora of Great Britain and Ireland, London (1992); Sherwood M.A. & Coppins B.J., Notes R. Bot. Gard. Edinburgh 38: 367-371 (1980).

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

Lichen Photobionts: Primary photobiont absent or present; chlorococcal and trentepohlioid. Secondary photobiont 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: External filaments absent. Periphyses: Present. Epithecium: Apical cells brown. Interascal Hyphae: Present, scarcely branched to distinctly branched, not or scarcely anastomosed. Hypothecium: White.

Ascospores: 1–2 per ascus, oblong, 90-170 µm long, 22-40 µm wide, obtuse; septa present; both transversally and longitudinally; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

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