Description from Flora of China
Trichomanes javanicum Blume, Enum. Pl. Javae 2: 224. 1828; Cephalomanes javanicum var. sumatranum (Alderwerelt) K. Iwatsuki; C. laciniatum (Roxburgh) De Vol; C. rhomboideum Bosch; C. sumatranum (Alderwerelt) Copeland; C. zollingeii Bosch; T. laciniatum Roxburgh; T. sumatranum Alderwerelt.
Plants 10-18 cm tall. Rhizome densely covered with dark brownish multicellular hairs at apex. Stipe dark brown, 2-5 cm × ca. 1 mm, with sparse spreading multicellular hairs. Rachis brown, narrowly winged at apex, with sparse reddish brown multicellular hairs. Lamina 1-pinnate, linear-lanceolate, 8-15 × 1.5-2 cm, papery, glabrous; pinnae 15-20 pairs, closely spaced or imbricate to neighboring ones, rhomboid, 1.5-2.5 cm × 5-8 mm, smaller upward, decurrent on rachis, alternate, subsessile, base cuneate, margin lacerate, apex rounded to obtuse. Veins obviously raised on each surface, light brown, each tooth containing a single veinlet. Sori on acroscopic to distal side of pinnae, rarely basiscopic distal portion; involucres tubular, ca. 2 mm, narrowly winged, mouth truncate or slightly wavy; receptacles projecting, brown, ca. 5 mm, slightly bent. 2n = 64.
On rocks or near streams in forests, shaded and very wet habitats; 200-800 m. Hainan, E and S Taiwan [India, Indonesia, Japan (Ryukyu Islands), Malaysia, Myanmar, New Guinea, Thailand, Vietnam].