4. Octoblepharum Hedw. 八齿藓属 ba-chi xian shu
Spec. Musc. Frond. 50. 1801.
Plants small to medium-sized, whitish to grayish green, in loose to rather dense cushions. Stems short, simple or sparsely branched. Leaves erect-patent, flexuose or reflexed from a slightly sheathing base, ligulate, obtuse-apiculate to shortly mucronate apex, flattened or terete-triangular; margins entire to slightly serrulate at the apex; costae broad, thick, filling almost the entire upper lamina, convex on abaxial side in cross section, costal leucocysts in 2–10 layers, enclosing a nearly centrally positioned chlorocyst layer; the chlorocysts triangular in the upper part of leaves, quadrangular at leaf base in cross section; hyaline lamina cells small, confined to both sides of costa at leaf base. Autoicous or dioicous. Setae terminal or lateral, short to elongate; capsules erect, oblong-ovoid to cylindrical, symmetric, stomata superficial; peristome teeth 8 or 16, broad-lanceolate, smooth to vertically striate-reticulate, properistome present; opercula conic-rostrate with a long oblique beak. Calyptrae cucullate, smooth, entire at base.