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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Tehler A. (95-11-27) 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: 8. Dirina. Roccellaceae Chevall. (1826); Arthoniales.

Taxonomic Literature: Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero

Special 7: 1-893 [357] (1985); Poelt J. & Vezda A., Biblioth.
Lichenol. 9: 1-258 [99-100] (1977); Purvis O.W. in: Purvis O.W. et
al. (eds), The Lichen Flora of Great Britain and Ireland, London
(1992); Tehler A., Opera Bot. 70: 1-86 (1983); Tehler A., Can. J.
Bot. 68: 2458-2492 (1990); Tehler A. in Nash T.H. III et al. (eds)
Lichen Flora of the Greater Sonoran Desert Region vol. 1, 178-180,
Tempe (2002); Tehler A., Feige G.B. & Lumbsch H.T., Lichenologist
27: 255-260 (1995).

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

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

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

Thallus: Crustose, granular, rimose, or areolate (primarily areolate). Thallus Outline: Soon disappearing or persistent. Upper Surface: Grey, brown, or brownish yellow; special structures absent or present:; not pseudocyphellate; eciliate; without hairs; not isidate; not sorediate or sorediate; not cephalodiate; not lobulate; without granules granules, without thalloconidia thalloconidia. Lower Surface: Attached by the whole lower surface; special structures absent; not pseudocyphellate; not cyphellate; not rhizinate; without thalloconidia thalloconidia; not cavernulate; not tomentose.

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Apothecioid, orbicular or irregular, forming all across the thallus surface, not emerging, soon sessile, stromatic. Margin: Prominent. Exciple: White. Periphyses: Absent. Epithecium: Apical cells brown. Interascal Hyphae: Present, distinctly branched, distinctly anastomosed. Hypothecium: Black or brown.

Ascospores: c. 8 per ascus, fusiform or curved, 17-33 µm long, 4-7 µm wide, obtuse or aciculate; septa present; transversally septate, 3-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 or sessile to stipitate, formed all accross the thallus surface or along the thallus periphery.

Secondary Metabolites: Not detected or present, of the following substance class(es): orcinol depsides.

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