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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Aptroot A. (95-02-18) and Scholz P. (02-05-14); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 2. Chromatochlamys. Thelenellaceae H. Mayrhofer (1986); Pyrenulales.

Taxonomic Literature: Mayrhofer H. in Nash T.H. III et al. (eds) Lichen Flora of the Greater Sonoran Desert Region vol. 1, 130-131, Tempe (2002); Mayrhofer H. & Poelt J., Herzogia 7: 13-79 (1985); Purvis O.W. & James P.W. in: Purvis O.W. et al. (eds), The Lichen Flora of Great Britain and Ireland, London (1992).

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

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

Thallus: Crustose, not subdivided parts, granular or rimose. Upper Surface: Grey, white, or brownish yellow; 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, forming all across the thallus surface, not emerging, becoming adnate. Wall: Not carbonized, not fused. Margin: External filaments absent. Exciple: Black, brown, or brownish yellow. Periphyses: Absent. Interascal Hyphae: Present, distinctly branched, distinctly anastomosed. Hypothecium: Brownish yellow.

Asci: Tholus thickened, not amyloid; ocular chamber indistinct; dehiscence bitunicate.

Ascospores: 1–2 to c. 8 per ascus, fusiform or oblong, 44-110 µm long, 10-27 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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