3. Anoectangium crassinervium Mitt. 粗肋丛本藓 cu-le cong-ben xian
J. Proc. Linn. Soc., Bot., Suppl. 1: 31. 1859. Type. China: Xizang (Tibet), T. Thomson 127 (holotype NY).
Plants small, 6–10 mm high, yellowish green, in dense tufts. Stems simple or monopodial; in cross section outer cortical cells small, thick-walled, central strand absent. Leaves involuted when dry, oblong-ovate or oblong-lanceolate, 0.4–1.0 mm × 0.2–0.3 mm, obtuse or more or less acute at the apex; basal portion hardly widened and not constricted; margins flat, entire; upper and median laminal cells irregularly quadrate or more or less hexagonal, 4–12 µm × 4–8 µm, thin-walled, with round unipapillae; basal cells irregularly rectangular, 12–28 µm × 8–12 µm; abaxial superficial cells of costa above the mid-leaf linear-rectangular. Sporophytes not seen.