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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Keller C. (98-05-20); revised; to be published after submission.

Nomenclature: Current taxonomic status: basionymous or accepted. Taxonomic rank: genus. Heteroplacidium. Verrucariaceae Zenker (1827); Verrucariales.

Taxonomic Literature: Taxonomic notes: Involucrellum not developed; asci clavate; pycnidia of Xanthoria type. Breuss O., Stapfia 23: 1-174 (1990) - sub Catapyrenium; Linzer Biol.Beitr. 28: 529-533 (1990) - sub Catapyrenium; Breuss O., Pl. Syst. Evol. 185: 17-33 (1993) - sub Catapyrenium; Breuss O., Breuss O., Crypt. Bot. 5: 177-183 (1995) - sub Catapyrenium; Breuss O., Linzer Biol. Beitr. 98B Suppl.: 35-53 (1996) - sub Catapyrenium; Breuss O., Ann. Naturhist. Mus. Wien 98B Suppl.: 35-50 (1996); Breuss O. & McCune B., Bryologist 97: 365-370 (1994) - sub Catapyrenium; Thomson J.W., Bryologist 90: 27-39(1987) - sub Catapyrenium.

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

Thallus: Crustose, not subdivided parts, squamulose. Upper Surface: Brown or grey; special structures absent. Lower Surface: Attached by holdfasts; special structures present:; not pseudocyphellate; not cyphellate; rhizinate; without thalloconidia thalloconidia; not cavernulate.

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Perithecioid, orbicular, forming all across the thallus surface, not emerging. Wall: Not fused. Margin: Indistinct; external filaments absent. Exciple: Brown or white. Periphyses: Present. Hymenium: Iodine reaction: Lugol’s negative, hemiamyloid. Interascal Hyphae: Absent. Hypothecium: Brown or white.

Asci: Ocular chamber indistinct; dehiscence verrucarial; exoascus not amyloid, not hemiamyloid.

Ascospores: c. 8 per ascus, ellipsoid, 11-16 µm long, 5-7.5 µm wide, obtuse; septa absent; 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, formed all accross the thallus surface.

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