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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: accepted or basionymous. Taxonomic rank: genus. Involucropyrenium. Verrucariaceae Zenker (1827); Verrucariales.

Taxonomic Literature: Taxonomic notes: Perithecia between squamules; involucrellum developed; asci clavate. Breuss O., Stapfia 23: 1-153 (1990) - sub Catapyrenium; Breuss O., Linzer Biol. Beitr. 28: 529-533 (1996); Breuss O., Linzer Biol. Beitr. 98B Suppl.: 35-50 (1996); Breuss O. & McCune B., Bryologist 97: 365-370 (1994) - sub Catapyrenium.

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

Thallus: Crustose, not subdivided parts, squamulose. Thallus Outline: Soon disappearing or persistent. Upper Surface: Brown or grey; special structures absent. Lower Surface: 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. Wall: Not fused. Margin: Indistinct; external filaments absent. Exciple: Black or brown. Periphyses: Present. Hymenium: Iodine reaction: Lugol’s negative, hemiamyloid. Interascal Hyphae: Absent. Hypothecium: Black or brown.

Ascospores: c. 8 per ascus, ellipsoid, 13-21 µm long, 6-10 µm wide, obtuse; septa absent; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

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