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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Aptroot A. (95-02-10) and Scholz P. (07-07-24); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 40 (A. Aptroot 99-09-27)-42. Trichothelium. Trichotheliaceae (Müll. Arg.) Bitter & Schill (1927); Trichotheliales.

Taxonomic Literature: Aptroot A., Diederich P., Sérusiaux E. & Sipman H.J.M.,
Biblioth. Lichenol. 64: 1-220 [205-207] (1997); Aptroot A. &
Sipman H.J.M., Flora of the Guianas, Ser. E, 2: 1-57 (1993); Galloway
D.J., Flora of New Zealand lichens: i-lxxiii, 1-662 [587], Wellington
(1985); Hafellner J. & Kalb K. in: Farkas E.+., Lücking R.
& Wirth V. (eds), Biblioth. Lichenol. 58: 161-186 [174] (1995);
Harris R.C., A taxonomic revision of the genus Arthopyrenia A.
Massal. s. lat. (Ascomycetes) in North America. - Ph. D. diss.,
Michigan State Univ., East Lansing (1975); Lücking R., Nova
Hedwigia 52: 267-304 (1991); Lücking R., Cryptog. Mycol. 27: 121-147 (2006); Santesson R., Symb. Bot. Upsal. 12: 1-
590 [266-279] (1952).

Biogeography: Checklist records: Guianas, New Guinea, New Zealand, Sonoran Desert, and United States and Canada (continental).

Lichen Photobionts: Primary photobiont present; trentepohlioid. Primary photobiont taxonomy: Phycopeltis; Trentepohliaceae; Trentepohliales, Chlorophyceae, Eukariota. Secondary photobiont absent.

Thallus: Crustose, not subdivided parts, granular. Upper Surface: Grey or green; 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 or irregular, forming all across the thallus surface, soon sessile. Margin: Prominent; external filaments present. Exciple: Black, red, or brown. Periphyses: Absent. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed.

Asci: Tholus thickened, not amyloid or amyloid, with amyloid tube; dehiscence bitunicate.

Ascospores: c. 8 per ascus, oblong-obtuse or fusiform, 18-190 µm long, 2-20 µm wide, obtuse or aciculate; septa present; transversally septate or both transversally and longitudinally, 3-35-transversally septate; wall thin or thick, distinctly differentiated into primary and secondary wall, not thickened at the septum, not constricted where the septum meets the spore wall, hyaline, in Lugol's Solution negative, wall not ornamented.

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