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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Lutzoni F. (96-02-07); revised; to be published after submission.

Nomenclature: Current taxonomic status: basionymous or accepted. Taxonomic rank: genus. Number of known taxa within this rank: 11 (A. Aptroot 99-09-27). Ionaspis. Hymeneliaceae Körb. (1855); Acarosporineae; Lecanorales.

Type Information: Type: Ionaspis chrysophana (Körb.) Th.Fr. ex Stein (= I. suaveolens (Fr.) Th.Fr. ex Stein.

Taxonomic Literature: Aptroot A., Diederich P., Sérusiaux E. & Sipman H.J.M., Biblioth. Lichenol. 64: 1-220 [73] (1997); Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero Special 7: 1-893 [387-388] (1985); Coppins B.J. & Dobson F.S. in: Purvis O.W. et al. (eds), The Lichen Flora of Great Britain and Ireland, London (1992); Eigler G., Diss. Bot. 4: 1-195 [156-157] (1969); Jørgensen P.M., Graphis Scripta 2: 118-121 (1989); Lutzoni F.M. & Brodo I.M., Bryologist 97: 393-395 (1994); Lutzoni F.M. & Brodo I.M., Syst. Bot. 20: 224-258 (1995); Magnusson A.H., Goeteb. Bot Traedg. 8: 1-47 (1933).

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

Lichen Photobionts: Primary photobiont present; chlorococcal and trentepohlioid. Primary photobiont taxonomy: Trentepohlia (A. Beck 22-05-97); Trentepohliaceae; Trentepohliales, Ulvophyceae, Eukariota. Secondary photobiont absent.

Thallus: Indistinct or crustose, rimose. Upper Surface: Grey, brownish yellow, pink (rosé), or white; 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, not emerging, becoming adnate to soon sessile. Margin: Indistinct to prominent; external filaments absent. Exciple: White or brownish yellow. Periphyses: Absent. Epithecium: Apical cells green or brownish yellow. Hymenium: Iodine reaction: Lugol’s negative or Lugol’s positive, not hemiamyloid. Interascal Hyphae: Present, scarcely branched to distinctly branched, distinctly anastomosed. Hypothecium: White.

Ascospores: c. 8 per ascus, ellipsoid, broadly ellipsoid, or globose, (8)-11.5-13.5-15.5-(21.5) µm long, (3)-5.5-7-8.5-(11) µm wide, obtuse; septa absent; wall thin or thick, distinctly differentiated into primary and secondary wall, 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.

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