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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Poelt J. (95-03-14) and Scholz P. (06-06-13); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: genus. Number of known taxa within this rank: 30. Xanthoria. Teloschistaceae Zahlbr. (1898); Teloschistineae; Lecanorales.

Taxonomic Literature: Aptroot A., Diederich P., Sérusiaux E. & Sipman H.J.M., Biblioth. Lichenol. 64: 1-220 [209] (1997); Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest, N.S. 7: 1-893 [817-820] (1985); Galloway D.J., Flora of New Zealand. Lichens: 1-662 [617-620] (1985); Kärnefelt I., Cryptog. Bot. 147-203 (1989); Kärnefelt I., Arup U. & Lindblom L. in: Knoph J.-G., Schrüfer K. & Sipman H.J.M., Biblioth. Lichenol. 57: 253-264 (1995); Kondratyuk S. & Poelt J., Lichenologist 29: 173-190 (1997); Kondratyuk S.Ya. & Zelenko S.D., Ukrayins'k. Bot. Zhurn. 59(5): 598-607 (2002); Laundon J.R. 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 [645-647] (1992); Poelt J. & Petutschnik W., Nova Hedwigia 54: 1-36 (1992); Poelt J. & Tavares C.N., Port. Acta Biol. 9: 300-308 (1969); Rambold G. & Triebel D., Biblioth. Lichenol. 48: 1-201 [134] (1992.

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

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

Lichen Photobionts: Primary photobiont present; chlorococcal. Primary photobiont taxonomy: Asterochloris and Trebouxia (A. Beck 22-05-97); Trebouxiaceae; Trebouxiales, Trebouxiophyceae, Eukariota. Secondary photobiont absent.

Thallus: Foliose, not subdivided parts, lobed. Thallus Outline: Soon disappearing. Upper Surface: Red or orange; 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 holdfasts; special structures absent or present:; not pseudocyphellate; not cyphellate; not rhizinate or 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, forming all across the thallus surface, soon sessile to substipitate. Margin: Distinct to prominent; external filaments absent. Exciple: White or orange. Periphyses: Absent. Epithecium: Apical cells orange. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White.

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

Ascospores: c. 8 per ascus, ellipsoid, 9-18 µm long, 5-11 µm wide, obtuse; septa absent; wall thin, thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

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

Secondary Metabolites: Present, of the following substance class(es): (anthra-)quinones.

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