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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: 2. Lopacidia. Pilocarpaceae Zahlbr. (1905); Cladoniineae; Lecanorales.

Taxonomic Literature: Kalb K., Lich Neotrop. Fasc. VIII (1984); Müller Argoviensis J., Flora 64: 513-527 [523-524] (1881) - sub Patellaria multilocularis, Lopadium callichroum.

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

Thallus: Crustose, not subdivided parts, leprose or granular. Upper Surface: Green or olive; 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. Margin: Prominent; external filaments absent. Periphyses: Absent. Epithecium: Apical cells brown, hyaline, or brownish yellow. Interascal Hyphae: Present, scarcely branched to distinctly branched, distinctly anastomosed. Hypothecium: Brown, white, or brownish yellow.

Ascospores: c. 4 to c. 8 per ascus, 60-120 µm long, 5-13 µm wide; septa present; transversally septate or both transversally and longitudinally, 18-25-transversally septate; wall thick, distinctly differentiated into primary and secondary wall, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

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