Entosthodon obtusatus (Schimp. ex C. Müll.) Fife, Mem. New York. Bot. Gard. 45: 309. 1987.

Funaria obtusata Schimp. ex C. Müll., Syn. Musc. Frond. 2: 540. 1851. Protologue. Mexico. Mexico prope Mirador: Liebmann m. Aug. 

Plants green or yellow‑green, usually gregarious in lax to dense tufts. Stems erect, 3–4 mm high, simple or a with single subperigonial innovation, usually naked at base, leaves clustered above, with a single‑layered sclerodermis over 1–2 rows of small reddish thick‑walled cells, inner cortical cells larger, thin‑walled, central strand well developed. Leaves erect‑incurved when dry, slightly contorted, erect-spreading when wet, spathulate to broadly obovate, rounded obtuse, 1.5–2 mm long, concave, not decurrent; margins crenulate above, plane; costa ending below the apex; upper cells oblong-hexagonal, thin‑walled, smooth, 25–50 x 15–18 μm, not differentiated at the margins, toward the insertion becoming long‑rectangular, 50–100 x 17–25 μm, alar cells not differentiated. Autoicous. Setae reddish brown, straight to slightly flexuose, lightly twisted when dry, weakly hygroscopic, smooth, 6–20 mm long. Capsules reddish brown, obovate, neck 1/2 or less the capsule length, asymmetric, mouth transverse, somewhat constricted below the mouth when dry, wrinkled to sulcate in the neck, smooth above, 1.2–1.5 mm long; exothecial cells elongate, thick-walled, shorter in the neck, becoming oblate and thick‑walled in 2–4(–8) rows at the mouth; stomata phaneroporous, numerous in neck; opercula plano‑convex, with a slightly paler margin, cells subquadrate to oblate, thick‑walled, in spiral rows; annuli simple; peristome double, exostome inserted well below the mouth, teeth reddish brown, weakly sigmoid, not united at apex, linear-lanceolate, vertically papillose-striate, weakly trabeculate, endostome basal membrane low, segments 3/4 the exostome teeth length, yellowish, vertically papillose-striate above. Spores 25–32 μm in diameter, insulate-baculate. Calyptrae cucullate‑rostrate, 3 mm long, naked, smooth.