Monographs Details: Rozea
Authority: Sharp, Aaron J., et al. 1994. The Moss Flora of Mexico. Part Two: Orthotrichales to Polytrichales. Mem. New York Bot. Gard. 69 (2)
Family:Brachytheciaceae
Scientific Name:Rozea
Description:Genus Description - Plants slender to moderately robust, in dense, soft, green, golden, bronze, or reddish, shiny mats. Stems creeping, and irregularly branched, with branches suberect to ascending, densely foliate, usually curved; in section showing an epidermis of 1 layer of enlarged cells with thin outer walls surrounding 2-3 layers of small, thick-walled, reddish cells enclosing an area of large, thin-walled cells (central strand none); pseudoparaphyllia foliose. Stem and branch leaves similar, crowded, imbricate when dry, weakly homomallous to erect-spreading w h e n moist, concave, lanceolate to oblong-ovate, shortly acuminate and shortly decurrent, biphcate or less commonly with 1 median fold, rarely smooth; margins revolute, usually throughout, sermlate at the apex; costa single, sometimes forked, ending at or somewhat beyond the midleaf; upper median cells linear to linear-rhomboidal, smooth; cells across the insertion shorter and broader, quadrate to rectangular, frequently thick-walled, sometimes colored, often forming short decurrencies. Dioicous. Perichaetial leaves pale, erect, lanceolate to oblong-ovate, subulate-acuminate, ecostate; cells linear above, becoming shorter and laxer below. Setae elongate, slender, ± straight, smooth, reddish; capsules erect, oblong to cylindric, red-brown to golden or dark-yellow; exothecial cells long-rectangular, becoming shorter toward the mouth; annulus none; operculum rostrate, sometimes oblique, less commonly low-conic; exostome teeth inserted at the mouth, lanceolate and generally abmptly tapered near the middle, reddish, bordered, o n the front surface with a zig-zag median line and relatively narrow plates, densely cross-striolate below, papillose or rarely smooth above, on the back with crowded, projecting trabeculae; endostome yellow, smooth or finely papillose, basal membrane ± high, segments relatively narrow, keeled, perforate, or rudimentary, and cilia mdimentary or absent. Spores spherical, 12-25 µm, finely papillose. Calyptrae naked.

Discussion:

Rozea is a genus of five species, distributed in the highlands of tropical America (from Mexico to northern South America) and the Himalayan Mountains. The plants have some similarity to a Brachythecium. They grow in dense, shiny mats, often golden to red-brown. The creeping stems are freely branched, and the branches are subjulaceous, ascending and often curved. The leaves are biphcate or sometimes deeply folded in the middle. The margins are revolute nearly to the sermlate tip, the costa is single but sometimes forked, and the cells are linear and smooth above but subquadrate at the insertion. The capsules are erect and symmetric, and the peristome is the hypnoid type with the endostome tending to be somewhat reduced.

The genus was given a fuller treatment by Buck and Crum (1976).