Bryum leptocladon Sull., Proc. Amer. Acad. Arts 5: 282. 1861.
Anomobryum leptocladon (Sull.) Broth., Nat. Pflanzenfam. 1(3): 563. 1903. Protologue: Cuba. Moist places on the ground, Wright 62.
Plants small, green to yellow‑green in loose tufts to 3 mm high; rhizoids sparse at base. Leaves 0.5–0.9 mm long, imbricate, firm not contorted when dry, erect when wet, oblong‑ovate; apices short‑acuminate; margins plane throughout, not or indistinctly bordered, entire; costae percurrent to short‑excurrent; upper cells rhomboidal to rhomboidal‑hexagonal, thin‑walled, to 60 μm long, basal cells rectangular, firm‑walled, to 70 μm long. Dioicous. Setae 5–10 mm long, orange‑brown to red. Capsules 1–2 mm long, orange‑brown, suberect to horizontal, oblong‑pyriform, abruptly contacted to a slender neck nearly as long as the capsule; opercula 0.5 mm long, conic apiculate; annuli compound; exostome teeth yellow, densely papillose, endostome hyaline, lightly papillose, basal membrane to ½ of exostome teeth length, segments well-developed, narrowly perforate, cilia short, irregular, nodose, frequently rudimentary. Spores 14–18 μm, nearly smooth. Calyptra not seen.