9. Cyrto-hypnum versicolor (C. Müll.) Buck & Crum 红毛细羽藓 hong-mao xi-yu xian
Contr. Univ. Michigan Herb. 17: 68. 1990. Thuidium versicolor (C. Müll.) Jaeg. Ber. Thätigk. St. Gallischen Naturwiss. Ges. 1876–77: 249. 1878. Hypnum versicolor Hornsch. ex. C. Müll., Syn. Musc. Frond. 2: 494. 1851. Type. South Africa: Uitenhage.
Plants slender, small to medium-sized, up to 4 cm long, yellowish green to dark green or brownish, creeping to ascending, in small, lax mats. Stems remotely or densely bipinnately branched, sometimes with strong branches; rhizoids dense; central strand present; paraphyllia densely growing on stems, usually simple, 2–6 cells long, apical cells truncate and papillose, rarely acute and branched. Stem leaves remote, cordate-triangular to widely cordate-triangular, 0.25–0.50 µm long, gradually or suddenly narrowed to a lanceolate apex, usually secund above; margins narrow at base or widely revolute, papillose or entire; costa stout, vanishing below leaf apex; branch leaves dense, ovate to triangularly ovate; leaf cells polygonal to rectangular, 3–6 µm × 6–12 µm, both antical and ventral sides with sharp papillae. Autoicous. Inner perichaetial leaves oblong-ovate at base, long lanceolate above, sometimes longitudinally plicate; margins serrate, rarely ciliate. Setae ca. 2 cm long, orange red to orange yellow, finely papillose above; capsules oblong, brown to orange, inclined to horizontal; opercula 0.5–1.0 mm long; cilia 1–3, mostly connected at base. Spores 10–17 µm in diameter.