4. Andreaea wangiana Chen in Chen & Wan 王氏黑藓 wang-shi hei xian
Acta Phytotax. Sin. 7(2): 101. 1958. Type. China: Sichuan, C.-W. Wang 32837 (holotype PE); Shaanxi, S.-C. Lee (X.-J. Li) 716, 717a (paratypes PE); Yunnan, W.-S. Hsu 335 (paratype PE).
Andreaea densifolia auct. non Mitt., J. Proc. Linn. Soc., Bot., Suppl. 1: 7. 1859. C. Gao in X.-J. Li (ed.). Bryofl. Xizang 6. 1985.
Plants dark brown to black, to 1.0–2.8 cm high, in dense tufts. Stems slender, erect, fragile when dry, much branched, rarely single. Leaves 8–12 mm × 3.5–4.5 mm, fragile, closely appressed when dry, narrowly lanceolate from an ovate-oblong base, with acute, incurved apices, sometimes very shortly hyaline-pointed; margins entire, plane or somewhat incurved above, bistratose above the middle part; upper and median laminal cells dark-brown, round to nearly rounded, 5–8(–10) µm in diameter, thick-walled, smooth or nearly so; basal laminal cells rectangular to oblong, hyaline, yellowish, 20–40 µm × 6–8 µm, irregularly thick-walled, slightly pitted. Dioicous. Perichaetial leaves oblong-lingulate, obtuse to short-acuminate, ca. 2 mm long. Pseudopodium 2.0–2.4 mm long. Capsules exserted, oblong-cylindric, about 1.4 mm × 0.5 mm, upper half of capsules reddish brown, splitting to 4 valves when mature, lower half of capsules yellow to yellowish brown, not splitting. Spores brownish, 28–32 µm in diameter, densely papillose.