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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Sipman H. (98-01-15) and Scholz P. (02-05-18); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 150. Myriotrema. Synonyms: Leptotrema Mont.; Thelotremataceae (Nyl.) Stizenb. (1862); Ostropales.

Taxonomic Literature: Hale M.E., Mycotaxon 11: 130-138 (1980); Hale M., Bull. Br. Mus. Nat.
Hist. Bot. 8: 227-332 (1981); Kalb K., Mycotaxon 79: 319-328 (2001); Nagarkar M.B. & Hale M.E., Mycotaxon 35: 437-447 (1989); Salisbury G., Nova Hedwigia 29: 405-427 (1978).

Biogeography: Checklist records: Guianas, Thailand, and United States and Canada (continental).

Ecology: Biotroph; lichenized; lignicolous or corticolous; substrate non-calciferous.

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

Thallus: Crustose, not subdivided parts, granular or rimose. Upper Surface: Grey, green, white, or brownish yellow; special structures absent or present:; not pseudocyphellate; eciliate; without hairs; not isidate or isidiate; not sorediate; not cephalodiate; not lobulate or 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: Apothecioid or perithecioid, orbicular, forming all across the thallus surface, not emerging, becoming adnate to soon sessile. Margin: Distinct to prominent; external filaments absent. Exciple: Brown or brownish yellow. Periphyses: Absent. Epithecium: Apical cells hyaline. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed.

Ascospores: 1–2 to c. 8 per ascus, globose, oblong-obtuse, or ovoid, 9-250 µm long, 4-45 µm wide, obtuse; septa present; transversally septate or both transversally and longitudinally, formed by the endospore wall layer; wall thin, not thickened at the septum, dark brown, hyaline, or pale brown, in Lugol's Solution negative, wall not ornamented.

Secondary Metabolites: Not detected or present, of the following substance class(es): ß-orcinol depsidones, (anthra-)quinones, and xanthones.

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