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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Aptroot A. (95-02-18); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 1. Calathaspis. Cladoniaceae Zenker (1827); Cladoniineae; Lecanorales.

Taxonomic Literature: Aptroot A., Diederich P., Sérusiaux E. & Sipman H.J.M., Biblioth. Lichenol. 64: 1-220 [41] (1997); Aptroot A. & Sipman H.J.M., Willdenowia 20: 221-256 (1991); Lamb I.M., Weber W.A., Jahns H.M. & Huneck S., Occas. Pap. Farlow Herb. 4: 1-12 (1972); Stenroos S., Ann. Bot. Fenn. 25: 207-217 (1988).

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

Thallus: Crustose, not subdivided parts, subfruticose. Upper Surface: Grey; special structures absent. Lower Surface: Attached by holdfasts; special structures absent.

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: Distinct; external filaments absent. Exciple: White. Periphyses: Absent. Epithecium: Apical cells brownish yellow. Interascal Hyphae: Present, distinctly branched, distinctly anastomosed. Hypothecium: White or brownish yellow.

Ascospores: c. 8 per ascus, oblong or fusiform, 30-65 µm long, 10-20 µm wide, obtuse or aciculate; septa present; transversally septate or both transversally and longitudinally, 7-14-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): ß-orcinol depsidones.

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