4. Leucobryum chlorophyllosum C. Müll. 绿色白发藓 lu-se bai-fa xian
Syn. Musc. Frond. 2: 535. 1851. Type. Indonesia: Sumbawa, Zollinger s.n.
Plants small, 5–10 mm high, whitish green, in dense compact tufts. Stems erect, simple or rarely branched; central strand absent. Leaves dense on the top of stems, 2–4 mm × 0.5–1.0 mm, slightly curved when dry, erect-spreading when moist, linear to narrowly lanceolate above, gradually narrowed to subtubulose apices from a narrowly ovate base; margins entire; dorsal side of leaf acumina undulate, not prorate; in cross section, costae reaching to the leaf apices; costal chlorocysts quadrangular, on both sides of chlorocysts with leucocysts 1-layered in the upper part of leaves and 1–2-layered near leaf base; marginal border indistinct, 3–7 rows of narrowly rectangular cells near leaf base. Dioicous. Sporophytes not seen. [According to Yamaguchi (1993), setae 14–20 mm long; capsules horizontal to inclined, ovoid, 0.8–1.0 mm × 0.6–0.8 mm; opercula long rostrate, ca. 1.4 mm long; annuli of 1(–2) rows of cells; peristome teeth divided from tips to the middle, ca. 500 µm long, 90 µm wide at base. Spores 14–18 µm in diameter.]