Thallus: squamulose squamules: loosely attached by long and slender rhizines, irregularly lobate; lobes: mostly linear, 1.5-2.5 mm long and c. 1 mm broad, 0.20-0.35 mm thick surface: pale grayish brown, scantily whitish pruinose; pruina: ± punctiform medulla: composed of intricated filamentous hyphae (2.5-3.5 micro meter in diam.), without spherical cells; algal layer: c. 50-80 micro meter thick, algal cells: 7-12 micro meter in diam. lower cortex: cellular, brownish, composed of 2-3 layers of roundish-angular cells (10-13 micro meter in diam.) lower surface: brown, paler marginally, dull, without a rhizohyphal weft, rhizinate; rhizines: several per squamule, brown or blackening, up to 0.15 mm thick and several mm long Perithecia: broadly pyriform, up to 0.30 mm wide; exciple: colorless asci: clavate, 50-60 x 13-17 micro meter, 8-spored ascospores: narrowly ellipsoid to subfusiform, 13-17 x 5-6 micro meter Spot tests: all negative Secondary metabolites: none detected. Substrate and ecology: on soil among mosses World and Sonoran distribution: known only from the type collection from Chihuahua. Notes: Externally the species resembles small specimens of Catapyrenium psoromoides, from which it is easily separable anatomically. It approaches the European Cata-pyrenium alvarense which differs in having rhizohyphae and shorter ascospores.