12. Leptochilus decurrens Blume, Enum. Pl. Javae. 2: 206. 1828.
似薄唇蕨 si bao chun jue
Acrostichum lanceolatum (Fée) Hooker (1864), not Linnaeus (1753), nor Roxburgh (1816); A. listeri Baker; A. variabile Hooker; A. variabile var. laciniatum Hooker; Anapausia decurrens (Blume) C. Presl; Campium decurrens (Blume) Copeland; C. laciniatum Copeland; C. lanceolatum (Fée) Copeland; Colysis decurrens (Blume) Panigrahi; C. evrardii Tardieu; C. poilanei C. Christensen & Tardieu; Dendroglossa zeylanica (Fée) Copeland; Gymnopteris dichotomophlebia Hayata; G. feei T. Moore; G. feei f. anomala Beddome; G. feei var. pinnatifida Beddome; G. feei var. trilobata Beddome; G. wallichiana C. Presl; Leptochilus hilocarpus Fée; L. laciniatus (Hooker) Ching; L. laciniatus var. simplex Ching; L. lanceolatus Fée; L. listeri (Baker) C. Christensen; L. thwaitesianus Fée; L. zeylanicus Fée; Paraleptochilus decurrens (Blume) Copeland; P. decurrens var. lanceolata (Fée) R. D. Dixit.
Rhizome 2.5-3 mm in diam., dorsiventrally flattened, with only scattered strands of sclerenchyma (rarely also in ca. 6 bundle sheaths); sclerenchyma strands 20-100; roots densely set; scales pseudopeltate (sometimes peltate), densely set, slightly spreading, narrowly ovate or triangular, broadest below middle, 2-5 × 0.3-1 mm, margin denticulate; central region bearing multiseptate hairs at least when young, or central region glabrous; phyllopodia 1-7 mm apart, ± distinct. Sterile fronds: stipe 0-18 cm, base with 2 longitudinal ridges; lamina narrowly ovate to ovate (to narrowly obovate), 10-50 × 2.5-11 cm, abaxial surface with short glandular hairs, base decurrent almost to base of stipe, 1.2-1.7 mm in diam. Fertile fronds: stipe present, 14-50 cm; lamina linear to narrowly ovate to ovate, 0.1-1 cm wide; lateral veins 5-12 mm apart, prominent and distinct, ± straight or zigzag, dichotomously branched near margin, or below middle; no prominent veinlet situated parallel to veins, or each costal areole giving rise to 2 lateral veins, thus lateral veins seemingly branching at or near costa, costal areole bordered by several smaller areoles, no prominent connecting basiscopic vein branching off near costa; connecting veins anadromous, 3-8 between adjacent secondary veins; smaller veins ± sunken and indistinct. Sori acrostichoid, on whole surface of lamina; paraphyses present.
Epilithic or epiphytic on trunk bases, sometimes terrestrial, often on rocks beside streams in forests; 100-1800 m. Guangxi, Guizhou, Hainan, Taiwan, Yunnan [Bhutan, India, Indonesia, Malaysia, Malesia, Myanmar, Nepal, New Guinea, Philippines, Sri Lanka, Thailand, Vietnam; Pacific islands (Christmas Island)].
Nooteboom (Blumea 42: 282. 1997) suggested that Leptochilus trifidus Alderwerelt is a hybrid between L. decurrens and Colysis macrophyllus (Blume) C. Presl. The combination "Bolbitis laciniata" (Abeywickrama, Ceylon J. Sci., Sect. A, Bot. 13: 22. 1956) was not validly published because a full and direct reference to the author and place of valid publication of the basionym was not provided (Melbourne Code, Art. 41.5).