Bryum jamaicense Syed, J. Bryol. 7: 314. 1973.
Protologue: Jamaica. Ad margines silvae, Portland Gap, Ins. Jamaica, altitude 1650 m, c.fr., July 1926, W. R. Maxon (MO).
Plants small, green above, yellow‑red to brown below in loose tufts to 10–20 mm high; rhizoids brown, finely papillose. Leaves 1.2–1.7 mm long, erect when dry, erect‑spreading when wet, ovate to ovate‑spathulate; apices mucronate to cuspidate; margins plane, bordered by 2–4 rows of narrow, elongate, thick‑walled cells, often colored with age, subentire, crenulate to serrulate; costae percurrent or subpercurrent; upper cells hexagonal to rhomboidal, thin‑walled, 23–54 x 16 μm, basal cells rectangular, thin‑walled. Rhizoidal tubers red or reddish orange, with long-projecting (190–250 μm long) mammillae. Dioicous. Setae 20–25 mm long, brown. Capsules 2.0–3.5 mm long, brown, subcylindrical, neck distinct, narrower than the urn; opercula 0.5 mm long, nodding to pendent, conic apiculate; exostome teeth yellow to yellow‑red, papillose, endostome yellowish hyaline, lightly papillose, basal membrane to ½ of exostome teeth length, segments well-developed, broadly perforate, cilia 2–4, appendiculate. Spores 12–16 μm, lightly roughened. Calyptra not seen.