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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set not revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 2. Arctomia. Arctomiaceae Th. Fr. (1860); Agyriineae; Lecanorales.

Taxonomic Literature: Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero
Special 7: 1-893 [160] (1985); Henssen A., Svensk Bot. Tidskr. 63:
126-138 (1969); Poelt J. & Vezda A., Biblioth. Lichenol. 9: 1-258
[17] (1977); Purvis O.W. in: Purvis O.W. et al. (eds), The Lichen
Flora of Great Britain and Ireland, London (1992).

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

Lichen Photobionts: Primary photobiont present; cyanobacterial. Primary photobiont taxonomy: Nostoc; Nostocaceae; Nostocales. Secondary photobiont absent.

Thallus: Crustose, squamulose, granular, or rimose. Upper Surface: Brown or olive; special structures absent. 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, soon sessile. Margin: Indistinct to distinct; external filaments absent. Periphyses: Absent. Epithecium: Apical cells brown. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White or brownish yellow.

Ascospores: c. 8 per ascus, fusiform, 40-80 µm long, 4-5.5 µm wide, obtuse or aciculate; septa present; transversally septate, 7-14-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.

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