戟蕨 ji jue

Acrostichum tricuspe Hooker, Sp. Fil. 5: 272. 1864; Cheiropleuria tricuspis (Hooker) J. Smith; Gymnopteris tricuspis (Hooker) Beddome; Leptochilus tricuspis (Hooker) C. Christensen; Selliguea tricuspis (Hooker) Fraser-Jenkins.

Rhizome long creeping, 5-6 mm in diam., densely covered with scales; scales reddish brown, base ovate-lanceolate, 5-6 mm, margin minutely serrate, apex subulate and long caudate. Fronds remote. Stipe straw-colored or castaneous, 20-35 cm, glabrous, stipes of fertile fronds longer than those of sterile fronds. Laminae dimorphic. Sterile lamina deeply 3-lobed or pinnatilobate, lobes 20-35 × 2.5-7 cm, central lobe larger than lateral lobes, entire at margin, acuminate at apex; veins reticulate with simple or branched included veinlets, hardly visible; lamina leathery, pale green, glabrous on both surfaces. Fertile lamina with much narrower lobes, linear, 30-40 × 1-1.5 cm. Sori with simple paraphyses.

Epiphytic on tree trunks or rarely terrestrial; 500-800 m. Hainan [India (Sikkim), Malaysia, Thailand, Vietnam].