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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Grube M. (95-12-05); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 7 (A. Aptroot 99-10-08). Chrysothrix. Chrysotrichaceae Zahlbr. (1905); Arthoniales.

Taxonomic Literature: Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero Special 7: 1-893 [289-290] (1985); Galloway D.J., Flora of New Zealand Lichens: i-lxxiii, 1-662 [93-94], Wellington (1985); Laundon J.R., Lichenologist 13: 101-121 (1981); Purvis O.W. in: Purvis O.W. et al. (eds), The Lichen Flora of Great Britain and Ireland, London (1992); Thor G., Bryologist 91(4): 360-363 (1988).

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

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

Lichen Photobionts: Primary photobiont present; chlorococcal. Primary photobiont taxonomy: Chlorella (A. Beck 22-05-97); genus incertae sedis; family of unknown placement (incertae sedis), order of unknown placement. Secondary photobiont absent.

Thallus: Crustose, leprose, granular, or placodioid. Upper Surface: Green or 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.

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, not emerging, becoming adnate to soon sessile. Margin: Indistinct to distinct. Epithecium: Apical cells hyaline. Hymenium: Iodine reaction: hemiamyloid. Interascal Hyphae: Present, scarcely branched, distinctly anastomosed. Hypothecium: White.

Ascospores: c. 8 per ascus, ellipsoid, oblong, oblong-obtuse, or ovoid, 9-15 µm long, 2.5-5 µm wide, obtuse; septa present; transversally septate, 1-3-transversally septate; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

Secondary Metabolites: Present, of the following substance class(es): pulvinic acid derivatives.

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