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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Moberg R. (95-11-28); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: genus. Number of known taxa within this rank: 26. Dirinaria. Physciaceae Zahlbr. (1898); Lecanorineae; Lecanorales.

Taxonomic Literature: Awasthi D.D., Biblioth. Lichenol. 2: 1-108 (1975); Galloway D.J.,
Flora of New Zealand Lichens: i-lxxiii, 1-662 [162-164], Wellington
(1985); Hafellner J., Mayrhofer H., Poelt J., Herzogia 5: 39-79
(1979); Kashiwadani H., Ginkgoana 3: 1-77 (1975); Poelt J. &
Vezda A., Biblioth. Lichenol. 9: 1-258 [101] (1977); Rambold G.,
Mayrhofer H. & Matzer M., Pl. Syst. Evol. 192: 31-40 (1994).

Biogeography: Checklist records: Bolivia, Guianas, New Zealand, Sonoran Desert, Thailand, United States and Canada (continental), and Republic of South Africa.

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

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

Thallus: Foliose, not subdivided parts, lobed. Upper Surface: Grey or white; special structures absent or present:; not pseudocyphellate; eciliate; without hairs; not isidate or isidiate; not sorediate or sorediate; not cephalodiate; not lobulate; without granules granules, without thalloconidia thalloconidia. Lower Surface: Attached by the whole lower surface or attached by holdfasts; 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 to substipitate. Margin: Prominent; external filaments absent. Exciple: White or brownish yellow. Periphyses: Absent. Epithecium: Apical cells brown or brownish yellow. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: Brown, white, or brownish yellow.

Asci: Tholus thickened, amyloid, with non-amyloid narrow axial body and amyloid convergent flanks towards apex; dehiscence lecanoralean.

Ascospores: c. 8 per ascus, ellipsoid or oblong, 10-25 µm long, 5-10 µm wide, obtuse; septa present; transversally septate, 1-transversally septate; wall thin, thickened at the septum, dark brown, middle brown, grey, hyaline, or pale brown, in Lugol's Solution negative, wall not ornamented or ornamented.

Secondary Metabolites: Present, of the following substance class(es): orcinol depsides and ß-orcinol depsides.

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