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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Scholz P. (06-06-12) and Triebel D. (99-02-12; 01-08-10; 02-06-22); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 150. Catillaria. Catillariaceae Hafellner (1984); Teloschistineae; Lecanorales.

Taxonomic Literature: Taxonomic notes: Catillaria usneicola Etayo (Etayo 2000, 2002) is the only species without any visible thallus and with non-septate ascospores. The spores are 4.5-6 x 1.5 -2 µm. Bricaud O. & Roux C., Bull. Soc. Linn. Provençe 41: 117-138 [117-138] (1990); Coppins B.J. in: Purvis O.W., Coppins B.J., Hawksworth D.L., James P.W. & Moore D.M. (eds), The lichen flora of Great Britain and Ireland: 1-710 [166-171] (1992); Etayo J., Bull. Soc. Linn. Provençe 51: 153-162 (2000); Etayo J., Biblioth. Lichenol. 84:1-154 [39-40, 43] (2002); Fryday A.M. & Coppins B.J., Lichenologist 28: 507-512 (1996); Galloway D.J., Flora of New Zealand. Lichens: 1-662 [74-80] (1985); Hafellner J., Herzogia 6: 289-298 (1983) [.

Biogeography: Checklist records: Austria, Germany, Great Britain, Guianas, Italy, New Zealand, Sonoran Desert, Sweden and Norway, Thailand, United States and Canada (continental), Namibia, and Republic of South Africa.

Ecology: Biotroph; lichenized or lichenicolous; terricolous, lignicolous, corticolous, or epiphyllous; substrate non-calciferous or calciferous.

Lichen Photobionts: Primary photobiont present; chlorococcal. Primary photobiont taxonomy: Dictyochloropsis; genus incertae sedis; Dictyochloropsis-group, Trebouxiophyceae, Eukariota. Secondary photobiont absent.

Thallus: Indistinct or crustose, not subdivided parts, granular or rimose. Upper Surface: White, grey, black, olive, brownish yellow, or brown; 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, orbicular, forming all across the thallus surface, soon sessile. Margin: Distinct to prominent; external filaments absent. Exciple: White, grey, black, brownish yellow, or brown. Periphyses: Absent. Epithecium: Apical cells black or brown. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White, black, brownish yellow, or brown.

Asci: Tholus thickened, amyloid, entirely amyloid throughout; dehiscence lecanoralean.

Ascospores: c. 8 per ascus, ellipsoid, oblong-obtuse, or oblong, 6-16 µm long, 2-6 µm wide, obtuse; septa absent or present; transversally septate, 1-transversally septate; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

Conidiomata: Absent resp. not observed or present; pycnidial; immersed, formed all accross the thallus surface.

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