Craspedophyllum rugosum

Craspedophyllum rugosum Grout, comb. nov
Micromitrium rugosum Grout, Bryologist 47: 3. 1944,
Plants in thin, close mats with the habit of C. mucronifolium; primary stems creeping, 2 cm. or more long, the secondary stems short, mostly less than 5 mm. long; leaves strongly contorted and incurved when dry, erect-spreading when moist, about 1.4 X 0.6 mm., oblong-lingulate, of nearly uniform width, strongly rugose above, entire, obtuse and mucronate above, the mucro mostly innexed and so often making the leaf appear emarginate ; costa nearly uniform in width, mostly excurrent into the short mucro; cells of the upper f-f of the leaf subcircular, bulging to mammillose, 5-6 y, in diameter, in the basal i somewhat larger, longer than broad; basal marginal cells linear, forming a narrow border about £ of the length of the leaf; seta about 5 mm. long, the slender neck of about the same length; calyptra hairless ; operculum rostrate; peristome rudimentary, apparently a narrow membrane in the not fully ripened capsules.
Type locality: British West Indies (John & Alice Northrop 342; type in the Chicago Mus. Nat. Hist.)
Distribution: Known only from the type locality.