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Published In: Journal of Bryology 7: 314. f. 20, 26–27. 1973. (J. Bryol.) Name publication detail

Project Name Data (Last Modified On 2/22/2011)
Acceptance : Accepted
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Bryum jamaicense is a segregate of the capillare-complex. It differs from most members of the complex in having erect rather than twisted leaves when dry and consistently percurrent costae. The presence of red to reddish orange tubers with long projecting mammillae separates it from all other Central American species of Bryum. When its distinctive spinose tubers are absent this species is indistinguishable from some expressions of B. capillare. The type of Bryum jamaicense was issued as Bryum capillare number 1385 in the Cryptogamae exsiccatae (Museo Hist. Natur. Vindobonensi) series.

Illustrations: Syed (1973, Fig. 26 a–k, Fig. 27 a–j). Figure 146 G–J.
Habitat: On wet shaded bank; 2280 m.
Distribution in Central America: GUATEMALA. San Marcos: Standley 66247b (F).
World Range: Mexico; Central America; Caribbean.


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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.



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