Pseudocrossidium austrorevolutum (Besch. in Britt.) Zand., Bull. Buffalo Soc. Nat. Sci. 32: 119. 1993. 

         Barbula austrorevoluta Besch. in Britt., Bull. Torrey Bot. Club 23: 480. Protologue: Bolivia. Near La Paz, 1000 ft. April, 1885 [Rusby] (3129). 

Plants small, green above, brown below, in tufts, 5–8 mm high. Stems red, not or sparsely branched, hyalodermis weakly present, central strand well-developed; rhizoids sparse. Axillary hairs 5–6 cells long, all cells hyaline. Leaves 0.8–1.2 mm long, elliptic to oblong, erect or spreading at base, spirally twisted when dry, erect-spreading to spreading when wet; apices broadly acute to obtuse-rounded, mucronate; margins spirally revolute to the apex, the interior cells of the revolute margins thin-walled, weakly papillose, hyaline or green; costa stoutly excurrent as a smooth mucro, guide cells and single (dorsal) stereid band well-developed, ventral surface layer enlarged, thin-walled, papillose; upper and basal cells not well-differentiated, upper cells in more or less regular rows, irregularly quadrate, subquadrate, hexagonal short oblate, 6–18 x12–14 μm, firm-walled, densely papillose by 4–6 crowded, c-shaped papillae, basal cells quadrate, subquadrate, to short-rectangular, firm-walled, smooth, 10–20 x 10–12 μm, hyaline or green, alar cells not differentiated. Dioicous (?). Sporophytes not seen.