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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Lücking R. (95-08-01); revised; to be published after submission.

Nomenclature: Current taxonomic status: basionymous or accepted. Taxonomic rank: genus. Number of known taxa within this rank: 5 (A. Aptroot 99-09-27). Gyalectidium. Gomphillaceae W. Watson ex Hafellner (1984); Ostropales.

Taxonomic Literature: Santesson R., Symb. Bot. Upsal. 12: 1-590 [352-362] (1952); Sérusiaux E., Nord. J. Bot. 13: 447- 461 (1993); Vezda A. & Poelt J., Folia Geobot. Phytotax. 22: 179-198 (1987).

Biogeography: Checklist records: United States and Canada (continental) and Guianas.

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

Thallus: Crustose, not subdivided parts, granular. Upper Surface: Green, grey, or white; special structures absent. Lower Surface: Attached by the whole lower surface; special structures absent or present:

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

Ascospores: 1–2 per ascus, ellipsoid or oblong-obtuse, 30-88 µm long, 10-30 µm wide, obtuse; septa present; both transversally and longitudinally; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

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