Tuerckheimia valeriana (Bartr.) Zand., Misc. Bryol. Lichenol. 8: 27. 1978.
Leptodontium valerianum Bartr., J. Wash. Acad. Sci. 19: 18. 1929. Gymnostomum valerianum (Bartr.) Zand., Bryologist 75: 277. 1972. Protologue: Costa Rica. Piedra Blanca, Province of San José, Costa Rica, altitude 2,400 meters, Oct. 9, 1927, Valerio 86.
Plants small, caespitose or tufted, light-green to yellowish green, at times somewhat glaucous. Stems 2–3 cm high, sparsely and irregularly branched, central strand well-developed, sclerodermis present; rhizoids red-brown, smooth. Leaves evenly spaced, spreading when wet, spreading incurved from the base, weakly catenulate and twisted when dry, concave to keeled with a broad central groove, oblong to linear-lanceolate, 2–3 mm long; apices acute, apiculate; margins plane, coarsely and distantly dentate in upper half; costae percurrent to shortly excurrent, guide cells and two stereid bands present, ventral surface cells quadrate, papillose, dorsal surface cells small, thick-walled; upper cells homogeneous, subquadrate to hexagonal, 7–10 μm, at times short-rectangular near costa, walls firm to thick, pluripapillose, papillae massive, multiple, centered over the lumina, basal cells weakly differentiated, short-rectangular, 2–4:1 longer than wide, smooth, marginal cells not differentiated. Dioicous. Perichaetial leaves weakly sheathing otherwise not differentiated. Sporophytes unknown.