8. Floribundaria M. Fleisch. 丝带藓属 si dai xian shu
Hedwigia 44: 301. 1905.
Plants slender, dull, yellowish green or yellowish brown, not glossy, in loosely pendulous mats. Primary stems creeping; secondary stems pendulous, loosely branched or irregularly pinnately branched. Stem and branch leaves similar, but branch leaves smaller, complanately appressed when dry, cordate, oblong-ovate, ovate-lanceolate to narrowly lanceolate, often gradually acuminate above, with a slender or hairy apex; margins usually serrulate or coarsely serrate near the apex; costae single, slender, vanishing about mid-leaf; leaf cells elongate-rhomboidal to linear, thin-walled, often opaque, rarely pellucid, finely pluripapillose, sometimes unipapillose; alar cells slightly differentiated; axillary hairs consisting of 1–2 brownish, short basal cells and 1–2 hyaline apical cells. Dioicous. Inner perichaetial leaves narrowly ovate-lanceolate, with a long, slender to piliferous apex, often ecostate. Setae short, smooth, often curved; capsules oblong-ovoid to shortly cylindrical; opercula conic, obliquely short- to long rostrate; annuli consisting of 1–2 rows of large, thick-walled cells; peristome double; exostome teeth lanceolate to narrowly lanceolate, densely papillose above, cross-striolate at the base; endostome segments linear-lanceolate, nearly as long as the teeth, keeled, papillose, usually perforate; basal membrane low to high; cilia often absent, sometimes rudimentary. Calyptrae cucullate or mitrate, lobed at the base, often hairy, sometimes smooth. Spores spherical, finely papillose.