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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: 1. Helocarpon. Micareaceae Hafellner (1984); Cladoniineae; Lecanorales.

Taxonomic Literature: Coppins B.J., Bull. Brit. Mus. (Nat. Hist.), Bot. 11: 17-214 (1983) - sub Micarea c.; Hafellner H., Beih. Nova Hedwigia 79: 241-371 [285-286] (1984).

Biogeography: Checklist records: Austria, Italy, Sweden and Norway, and United States and Canada (continental).

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

Thallus: Crustose, not subdivided parts, granular. Upper Surface: Brown or grey; 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 to substipitate. Margin: Distinct to prominent; external filaments absent. Exciple: Brown or brownish yellow. Periphyses: Absent. Epithecium: Apical cells brown. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: Black or brown.

Ascospores: c. 8 per ascus, ellipsoid, oblong, or fusiform, 9-21 µm long, 2.5-4.5 µm wide, obtuse; septa absent or present; transversally septate, 1-1-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, formed all accross the thallus surface.

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