18. Trachycladiella (M. Fleisch.) M. Menzel 细带藓属 xi dai xian shu
J. Hattori Bot. Lab. 75: 74. 1994. Floribundaria sect. Trachycladiella M. Fleisch., Musci Buitenzorg 3: 826. 1908.
Plants rather robust and rigid, yellowish green or yellowish brown, sometimes reddish brown, not glossy, often in pendulous tufts. Primary stems creeping; secondary stems irregularly and remotely pinnately branched; branches 0.5–3.0 cm long. Stem and branch leaves more or less similar, ovate-lanceolate to triangularly ovate-lanceolate, undulate or strongly undulate throughout, rather abruptly narrowed to a long-acuminate, slender or piliferous apex, somewhat decurrent at the base; margins rugulose, serrulate to serrate above; costae single, slender, vanishing just above mid-leaf; median and upper leaf cells elongate-rhomboidal to linear, densely pluripapillose with papillae arranged along side cell walls; marginal cells rhomboidal to linear-rhomboidal, sometimes smooth; basal juxtacostal cells linear to rectangular, thick-walled, porose, smooth; alar cells weakly differentiated, lax, rectangular, smooth; axillary hairs consisting of 1 short, brownish basal cell and 2 short-rectangular, hyaline upper cells. Dioicous. Setae 1.3–2.5 mm long, roughened; capsules oblong-ovoid; peristome double; exostome teeth lanceolate, papillose above, striolate below; endostome segments linear, keeled, perforate; basal membrane moderately high; cilia rudimentary. Calyptrae mitrate, smooth. Spores spherical, finely papillose.