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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) and Scholz P. (02-05-14); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 4. Clavascidium. Verrucariaceae Zenker (1827); Verrucariales.

Taxonomic Literature: Taxonomic notes: Cells of upper cortex large; involucrellum not developed; asci
clavate; pycnidia of Xanthoria-type. Breuss O., Linzer Biol.Beitr. 22: 69-80 (1990) - sub Catapyrenium;
Breuss O., Linzer Biol. Beitr. 23: 533-536 (1991) - sub Catapyrenium;
Breuss O., Österr. Z. Pilzk. 2: 7-10 (1993) - sub Catapyrenium;
Breuss O. in: Daniels F.J.A., Schulz M. & Peine J. (eds): Flechten Follmann: 175-178, Cologne (1995) - sub Catapyrenium; Breuss O., Linzer Biol. Beitr. 98B Suppl.: 35-50 (1996); Breuss O. in Nash T.H. et al. (eds) Lichen Flora of the Greater Sonoran Desert Region vol. 1, 158-159, Tempe (2002); Breuss O. & McCune B., Bryologist 97: 365-370 (1994) - sub Catapyrenium; Harada H., Nat. Hist. Res. 2: 113-152 (1993) - sub Catapyrenium.

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

Thallus: Crustose, not subdivided parts, squamulose. Thallus Outline: Soon disappearing. Upper Surface: Brown (also cream); 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: External filaments absent. Exciple: Black, brown, or white. Hymenium: Iodine reaction: Lugol’s negative, hemiamyloid. Interascal Hyphae: Absent. Hypothecium: Black, brown, or white.

Asci: Tholus thickened, not amyloid; ocular chamber indistinct; dehiscence verrucarial; exoascus not amyloid, not hemiamyloid.

Ascospores: c. 8 per ascus, ellipsoid, 13-19 µm long, 6-11 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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