9. Ctenidium pinnatum (Broth. & Par.) Broth. 羽枝梳藓 yu zhi shu xian
Nat. Pflanzenfam. I(3): 1073. 1908. Stereodon pinnatus Broth. & Par., Bull. Herb. Boissier, ser. 2, 2: 991. 1902. Type: Japan. Liou Kiou (Ryukyu Is.), Faurie 1325.
Ctenidium plumulosum Bartr., Ann. Bryol. 8: 20. 1936, hom. illeg.
Plants small, soft, pale yellowish green. Stems prostrate, 1.5–2.5 cm long, pinnately to subpinnately branched; branches dense, flattened, lax, curved, 4–6 mm long; pseudoparaphyllia triangular or nearly so. Stem leaves erect-spreading or curved, slightly falcate-secund, 1.0–1.4 mm × 0.7–0.8 mm, broadly ovate-lanceolate, gradually acuminate, sometimes twisted at apex, cordate at base, long-decurrent, rarely plicate; margins recurved above, sometimes rugose, serrulate throughout; costae double, ca. 1/5 the leaf length, or absent; median leaf cells 40–45 µm × 4–5 µm, prorate, thick-walled; alar cells quadrate or shortly rectangular, thick-walled, decurrent alar cells distinctly differentiated, rectangular; branch leaves flattened, slightly falcate, 0.8–1.0 mm × 0.3–0.4 mm, broadly ovate-lanceolate, shortly acuminate. Dioicous. Inner perichaetial leaves erect, sometimes reflexed above, ovate- to triangular-lanceolate, rarely twisted at slender apex, serrulate above, costae single or forked, ca. 1/3 the leaf length, median cells thick-walled, porose. Setae 1.0–1.5 cm long, reddish brown, smooth; capsules horizontal, ovoid or ellipsoid, ca. 1 mm × 0.5 mm; opercula shortly rostrate. Spores 14–18 µm in diameter.