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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 6. Tremotylium. Thelotremataceae (Nyl.) Stizenb. (1862); Ostropales.

Taxonomic Literature: Galloway D.J., Flora of New Zealand Lichens: i-lxxiii, 1-662 [586], Wellington (1985).

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

Thallus: Crustose, not subdivided parts, rimose. Upper Surface: Grey or white; 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: Apothecioid, irregular, not emerging, becoming adnate, stromatic. Margin: Indistinct; external filaments absent. Periphyses: Absent. Interascal Hyphae: Present, distinctly branched, distinctly anastomosed.

Ascospores: c. 8 per ascus, ellipsoid, 60-240 µm long, 32-100 µm wide, obtuse; septa present; both transversally and longitudinally, formed by the proper spore wall; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

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