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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Wedin M. (95-11-27); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 1. Calycidium. Calycidiaceae Choisy ex Tibell (1984); Caliciales.

Taxonomic Literature: Galloway D.J., Flora of New Zealand Lichens: i-lxxiii, 1-662 [70-71], Wellington (1985) Tibell L., Beih. Nova Hedwigia 79: 597-713 (1984); Tibell L., Symb. Bot. Upsal. 27(1): 1-279 [65-68] (1987); Wedin M., Pl. Syst. Evol. 187: 219-241 (1993).

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

Thallus: Foliose, not subdivided parts, lobed. Upper Surface: Brown, green, brownish yellow, or olive; special structures absent. Lower Surface: Attached by holdfasts; special structures absent.

Medulla: Iodine reaction in Lugol's solution negative; not different with or without KOH pre-treatment (euamyloid).

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Apothecioid, orbicular, forming directly at the thallus margin, soon sessile to substipitate. Margin: Indistinct to distinct. Exciple: Brown. Hymenium: Mazaedioid. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: Brown or brownish yellow.

Ascospores: c. 8 per ascus, ellipsoid or globose, 4-8 µm long, 4-8 µm wide, obtuse; septa absent; wall thin, not thickened at the septum, pale brown or dark brown, in Lugol's Solution negative, wall not ornamented or ornamented.

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