Lichenologist 6: 143 (1974).
Protolog: Podetia brevae, ad 5 mm longae, scyphis 5-10 mm altis terminatis; scyphae sessilia, inferne fuscae vel infuscatae cinereo-virescentes, cum schizidiis corticatis 0.1-0.5 mm diametro, vel plus minusve ecorticatae. Squamulae thalli primarii mediocres, ad 6 mm altae, horizontales vel ascendentes, margine partim inciso, supra cinereo-virescentes vel brunnescentes, infra albidae; cortex squamularum 30-60 µm crassus, pagina superiora fissurata, verruculosa vel laevigata; medulla 90-220 µm crassa. Apothecia et pycnidia non visa. Medulla K-, C-, KC-, PD-. Thallus acidum imbricaricum continens. Differt a C. pyxidata scyphis sine stipibus conspicuis, margine scyphorum ad terram expanso, et acido imbricarico continenti.
Protolog type data: Holotypus: Islandia centralis, Thjórsárver, Oddkelsalda, ad terram ad alt. 590 m, 15 Juli 1971, H. Kristinsson 24582 (ICEL).
Type locality: Iceland, Central Highlands, Thjórsárver, Oddkelsalda, 590 m, 15 July 1971, H. Kristinsson 24582 (AMNH - holotype). Fide Ahti (xxx).
Type locality coordinates: 64°34'57"N, 18°43'8.4"W; 64.5825°, -18.719°.
Molecular barcode: Data lacking.
Thallus: Podetia short, to 5 mm long, forming almost astipitate, 5-10 mm broad expanded cups; the margins more or less spreading over the ground; the outside of the cups grey-green to brown, glomerulate, the inside brown-green to brown, with corticated areolae 0.1-0.5 mm diameter, or more or less ecorticate. The primary squamules medium sized, to 6 mm across, horizontal to ascending, margin partly incised; the upper surface green to brownish; the lower surface white. The cortex of the primary squamules 30-60 µm thick, the surface fissured to verruculose or smooth, the medulla 90-220 µm thick. Apothecia and pycnidia unknown.
Photobiont: Data lacking.
Chemistry: Medulla K-, C-, KC-, PD-. Imbricaric acid.
Ecology: Data lacking.
Distribution Type: Northern temperate. Iceland, Norway, USA: South Dakota, Wyoming.
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