细叶藓科 xi-ye xian ke
by Gao Chien and Cao Tong
Plants minute, gregarious or larger, in dense tufts. Stems simple or forked, not tomentose below. Leaves more or less subulate from a narrow base; costa terete above, often filling most of the subula, subpercurrent to excurrent; cells smooth, usually short above, oblong-rhomboidal below, alar cells generally not differentiated. Dioicous or autoicous. Setae usually elongate, erect or somewhat curved; capsules mostly exserted, erect, symmetric, mostly rounded-pyriform, wide-mouthed when dry and empty; opercula rostrate; annuli absent or large, simple or compound; peristome (endostomal segments) usually present, 16, lanceolate, entire, sometimes slightly perforated or split at the tip. Calyptrae mostly cucullate, sometimes mitrate. Spores spherical, small in number.