1. Herpetineuron acutifolium (Mitt.) Granzow 尖叶羊角藓 jian-ye yang-jiao xian
Bryologist 92: 385. 1989. Bryonorrisia acutifolia (Mitt.) Enroth, J. Bryol. 16: 407. 1991. Anomodon acutifolius Mitt., J. Proc. Linn. Soc., Bot., Suppl. 1: 126. 1859. Type. India: Kumaon.
Plants medium-sized, yellowish green to green above, brownish below, in dense tufts. Primary stems prostrate, secondary stems irregularly pinnately branched; branches erect to more or less arcuate, usually attenuate and flagelliform; central strand present. Leaves of secondary stems and branches triangular-lanceolate, 1.2–1.8 mm × 0.7–0.8 mm, abruptly acuminate near the apex, somewhat concave, appressed when dry, erect-spreading when moist; margins plane, mostly entire, only serrulate at the apex; costa extending just beyond 2/3 the leaf length, almost straight throughout, only slightly sinuose above; leaf cells shortly rectangular to rhomboidal, smooth, sometimes projecting on the dorsal side of leaves; alar cells not differentiated. Dioicous. Perichaetial leaves not sheathing at base, shortly lanceolate with acute apex. Setae elongate, 9–10 mm long, reddish brown; capsules erect, symmetric, cylindrical, 2–3 mm long; opercula rostrate; annuli not differentiated; exostome teeth lanceolate, papillose and cross striate at base; endostome segments linear, nearly as long as the teeth, smooth; basal membrane low. Calyptrae not seen. Spores spherical, ca. 20 µm in diameter, finely papillose.