1. Radulina hamata (Dozy & Molk.) W. R. Buck & B. C. Tan 弯叶细锯齿藓 wan ye xi ju chi xian
Acta Bryol. Asiat. 1: 10. 1989 . Trichosteleum hamatum (Dozy & Molk.) Jaeg., Ber. Thätigk. St. Gallischen Naturwiss. Ges. 1876–77: 420. 1878. Hypnum hamatum Dozy & Molk., Ann. Sci. Nat., Bot., ser. 3, 2: 307. 1844. Type: Indonesia.
Plants grayish green or brownish yellow, slightly glossy, in mats. Stems prostrate, often branched; branches 2–3(–4) mm long. Leaves narrowly lanceolate, curved, gradually forming a long acuminate apex from concave, ovate-lanceolate base, 1.5–2.0 mm long, less than 0.5 mm wide; margins plane, clearly serrulate above; leaf cells linear, 50–70 mm × 6–8 µm, thin- to thick-walled, slightly pitted at base, with single row of numerous papillae over cell lumen; alar cells 2–3, large, thin-walled and hyaline. Inner perichaetial leaves abruptly long acuminate, serrate. Setae 1.0–1.7 cm long, papillose above, smooth below; capsules small, rounded ovoid, horizontally curved; opercula long-rostrate, beaks longer than capsules.