3. Andreaea rupestris Hedw. 岩生黑藓 yan-sheng hei xian
Spec. Musc. Frond. 47. 1801. Syntypes. Sweden: "Bructeri," sin. coll.; England, "Annaemontani," sin. coll.
Andreaea petrophila Ehrh. ex Fuernr, Flora 10 (Beibl. 2): 30. 1827.
Plants blackish green to black, or reddish brown to dark brown, up to 2 cm high in dense tufts. Stems erect or ascending, simple or sparsely branched. Leaves 0.70–0.76 mm × 0.30–0.36 mm, imbricate, appressed when dry, lanceolate from an ovate base to ovate-panduriform to panduriform, with acute to obtuse apex; margins entire, sometimes crenulate above in reference to the mammillae present on laminal cells, slightly incurved; upper laminal cells irregularly quadrate, rounded-rhomboid to short-rectangular, 8–16 µm × 4–8 µm, irregularly thick-walled, papillose to nearly smooth; basal cells elongate to narrowly rectangular, 20–60 µm × 2–6 µm, with strongly and irregularly thickened walls, pitted. Autoicous or dioicous. Perichaetial leaves oblong-lingulate, obtuse to acuminate, about 1.5–2.0 mm long. Pseudopodium 1.5–2.0 mm long. Capsules exserted, ovate-oblong, blackish brown, split to 4 values from near the base to the apex when mature. Spores red-brown, 20–28 µm in diameter, densely papillose.
3a. Andreaea rupestris ssp. rupestris 岩生黑藓原亚种 yan-sheng hei xian yuan-ya-zhong
Andreaea likiangensis Chen, Acta Phytotax. Sin. 7(2): 103. 1958. Type. China: Yunnan, Li-jiang Co., W.-S. Hsu 335a (holotype PE).
Plants are autoicous, usually blackish green to black, sometimes reddish black. Leaves are lanceolate from an ovate base. Papillae of laminal cells sometimes are not distinct.
Andreaea rupestris ssp. rupestris is different from A. rupestris ssp. fauriei by having ovate to ovate-lanceolate leaves and by its autoicous sexual condition. Plants of A. rupestris ssp. rupestris are often blackish, while those of A. rupestris ssp. fauriei are often reddish.