6. Polypodiodes lachnopus (Wallich ex Hooker) Ching, Acta Phytotax. Sin. 16(4): 27. 1978.
濑水龙骨 lai shui long gu
Polypodium lachnopus Wallich ex Hooker, Hookers Icon. Pl. t. 952. 1854; Goniophlebium lachnopus (Wallich ex Hooker) J. Smith; Schellolepis lachnopus (Wallich ex Hooker) J. Smith.
Rhizome long creeping, 5-6 mm in diam., densely covered with scales; scales broad and brown at base with ciliate margin, upper part black, subulate with entire margin. Fronds remote. Stipe straw-colored, 5-8 cm, glabrous. Lamina pinnatipartite, linear-lanceolate in outline, 40-60 × 5-7 cm, base cordate, apex acuminate. Segments 40-50 pairs, lanceolate, 2-3 cm × 5-7 mm, margin toothed, apex acute or obtuse; basal one or two pairs slightly shorter and deflexed. Veins reticulate to form 1 row of narrow areoles along each side of rachis and 1 row of large areoles along each side of costa, each areole containing a simple included veinlet, other veins free. Lamina papery or herbaceous, green, glabrous or subglabrous except rachis covered with hairs, abaxial surface sparsely scaly. Sori orbicular, terminal on included veinlets, in 1 row on each side of costa, medial.
Epiphytic on tree trunks; 1700-2000 m. Sichuan, Xizang, Yunnan [Bhutan, N India, Nepal].
A collection of this species (Polypodiodes lachnopus) was listed by Christ (Bull. Herb. Boissier 6: 869. 1898) as Polypodium yunnanense Franchet.
