Monographs Details: Ptychomitrium serratum Bruch & Schimp.
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:Ptychomitriaceae
Description:Distribution and Ecology - Plants relatively coarse, 1.5-4 cm high, in rather rigid, loose, dark-green to yellow-brown tufts. Leaves erect-incurved when dry, erect- to wide-spreading when moist, not or slightly plicate at the insertion, 3.7-4.7 mm long, lanceolate from an erect, oblong base, gradually narrowed to a bluntly acute apex; margins coarsely serrate nearly to the shoulders, ± revolute on lor both sides toward the base; costa percurrent; upper cells in longitudinal rows, bistratose at the in irregular streaks, about 8 µm wide, rounded-hexagonal, often somewhat broader than long; cells of the leaf base (above the area of insertion) oblong to oblong-linear, with lateral walls moderately thickened and straight or somewhat pitted. Setae single or, less commonly, in groups of 2 or rarely 4, 4.5-8 mm long; capsules 2.5-3 mm long, cylindric, oblong-cylindric, or fusiform, striate-plicate when dry and empty; annulus narrow (of about 2 rows of cells); peristome teeth long and slender, fused at base, bifid to about the middle, red, densely papillose or spiculose-papillose. Spores 13 µm, very finely papillose-roughened. Calyptrae smooth or rarely slightly scabrous near the apex.

Distribution and Ecology - On rocks on shaded, often dry banks, probably restricted to limestone, at moderate altitudes; Baja California, Coahuila, Distrito Federal, Hidalgo, Nuevo Leon, Oaxaca, Puebla, San Luis Potosi, Tamaulipas, Veracruz.—Mexico; Texas and Louisiana.

Discussion:

Fig. 310a-e

P. serratum (C. Müll.) B.S.G. ex Besch., Mem. Soc. Sci. Nat. Cherbourg 16: 286. 1872.

P. serratum B.S.G., Bryol. Eur. 3(fasc. 2/3). 1837, nom nud.

Brachysteleum serratum C. Miill., Syn. Muse. Frond. 1: 768. 1849.

This species differs from P. lepidomitrium especially in the oblong, generally straight-walled basal cells, fewer sporophytes per inflorescence, and smooth calyptrae.

Distribution:United States of America North America| Mexico North America|