23. Pylaisia Bruch & Schimp. in B.S.G. 金灰藓属 jin hui xian shu
Bryol. Eur. 5: 87 (fasc. 46–47 Mon. 1). 1851.
PylaisiellaKindb. ex Grout, Bull. Torrey Bot. Club 23: 228. 1896.
Plants slender to medium sized, yellowish, pale green or dark green, mostly glossy. Stems creeping, rhizoids numerous, irregularly or subpinnately branched; branches short, ascending, usually curved. Stem leaves and branch leaves similar, appressed when dry, erect spreading when moist, moderately concave, ovate-lanceolate or oblong-lanceolate, slenderly to shortly acuminate at apex; margins entire or serrulate near the apex; costae double, short, indistinct or absent; leaf cells rhomboidal to linear; alar cells numerous, quadrate. Autoicous. Inner perichaetial leaves oblong-lanceolate, serrulate above. Setae slender, smooth; capsules erect, symmetric, ovoid or cylindrical; opercula conic, shortly rostrate; annuli moderately developed or lacking; peristome double; exostome teeth narrowly lanceolate, yellowish or yellowish brown, cross-striolate at the base on dorsal surface, trabeculate on ventral surface; endostome segments slenderly lanceolate, as long as or shorter than the teeth, keeled, perforate; basal membrane low; cilia rudimentary or absent. Calyptrae cucullate, smooth, naked. Spores spherical, yellowish brown, densely papillose.