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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Lumbsch H. T. (98-03-19); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: genus. Number of known taxa within this rank: 6. Xylographa. Agyriaceae Corda (1838); Agyriineae; Lecanorales.

Taxonomic Literature: Aptroot A., Diederich P., Sérusiaux E. & Sipman H.J.M., Biblioth. Lichenol. 64: 1-220 [209] (1997); Brodo I.M., Graphis Scripta 4: 61-54; Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero Special 7: 1-893 [821] (1985); Galloway D.J., Flora of New Zealand lichens: i-lxxiii, 1-662 [620-621], Wellington (1985); Laundon J.R., Lichenologist 2: 101-151 (1963); Lumbsch H.T., J. Hattori Bot. Lab. 83: 1-73 (1997); Orange A. in: Purvis O.W. et al. (eds), The Lichen Flora of Great Britain and Ireland, London (1992).

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

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

Thallus: Indistinct or crustose, not subdivided parts, granular. Upper Surface: Grey 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 or with granules granules, without thalloconidia thalloconidia. 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 or linear, forming all across the thallus surface, becoming adnate to soon sessile. Margin: Distinct; external filaments absent. Exciple: Brown. Periphyses: Absent. Epithecium: Apical cells brown, brownish yellow, or olive. Hymenium: Iodine reaction: Lugol’s positive, not hemiamyloid. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White or brownish yellow.

Asci: Tholus thickened, amyloid, with amyloid cap or tube and flanks; dehiscence lecanoralean; exoascus euamyloid, hemiamyloid.

Ascospores: c. 8 per ascus, ellipsoid or oblong-obtuse, 9-16.5 µm long, 4-7.5 µm wide, obtuse; septa absent; 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.

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

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