Bryologist 27: 4, plate 2. 1924,.
Plants 2–3.5 mm. Leaves lingulate, lanceolate or ovate, 0.7–1.4 mm, margins recurved from near apex to near base, apex rounded or emarginate, piliferous; costa excurrent, with an abaxial epidermis, filaments of 1–4 cells, cells subspheric, with several papillae per cell, terminal cell subspheric; cells of leaf base 13–51 µm, medial and distal cells 11–20 µm, smooth, with 1–2 abaxial papillae or on either side in distal cells. Sexual condition dioicous or cladautoicous. Seta 8–16 mm. Capsule urn ovoid-cylindric, 1.3–2 mm; operculum 0.5–1 mm; peristome strongly twisted, 650–980 µm. Spores spheric, ovoid or oblong, finely papillose, 9–13 µm.
Phenology: Capsule mature Jan–Jun(-Aug).
Habitat: Soil and rocks under shrubs, shaded banks or in open sites in dry washes
Elevation: moderate elevations (600-1500 m)
Ariz., Calif., Colo., Nev., N.Mex., Tex., Utah, Mexico (Baja California), Mexico (Sonora), n Africa
Crossidium aberrans is easily distinguished by the smooth or 1-papillose cells of the distal leaf blade and by the low filaments with subglobose-papillose terminal cells.
"broad" is not a number."um" is not declared as a valid unit of measurement for this property.