Monographs Details: Pleuridium
Authority: Sharp, Aaron J., et al. 1994. The Moss Flora of Mexico. Part One: Sphagnales to Bryales. Mem. New York Bot. Gard. 69 (1)
Family:Ditrichaceae
Scientific Name:Pleuridium
Description:Genus Description - Very small, gregarious or loosely tufted plants, erect, simple or forked. Leaves usually erect-spreading or subsecund, scarcely altered on drying (occasionally imbricate below a comal tuft), gradually or sometimes abruptly elongate toward the stem tip, mostly narrow and subulate, sometimes abruptly subulate from a broad base, the lower leaves sometimes differentiated, and ovate-lanceolate; costa generally filling most of the awn and usually excurrent, at least in upper and perichaetial leaves; cells smooth, short to linear above, oblong-rhomboidal and rectangular below, not differentiated at the basal angles. Capsules immersed to shortly exserted, subglobose, broadly ellipsoidal, or ovoid, bluntly mucronate to apiculate or rostrate; operculum and peristome not differentiated. Spores spherical, papillose, brownish. Calyptrae cucullate (or rarely mitrate), smooth.

Discussion:

These are small mosses of ephemeral habit. A relationship to Ditrichum is made apparent by occasional hybridization. The leaves generally resemble those of a Ditrichum, being most often narrow and slenderly acuminate, with smooth cells, but the immersed, cleistocarpous capsules separate the genera.