3. Pteridrys C. Christensen & Ching, Bull. Fan Mem. Inst. Biol., Bot. 5: 129. 1934.
牙蕨属 ya jue shu
Authors: Shiyong Dong & Maarten J. M. Christenhusz
Plants terrestrial, 1-2 m tall. Rhizome creeping, ascending, or erect; rhizome apex and stipe base covered with lanceolate scales; scales brown, 0.8-1.5 cm, margins entire. Fronds close or clustered; stipe light to dark stramineous or brown. Lamina 2-pinnatifid at base, elliptic, oblong, or ovate-lanceolate, widest at or below middle; basal pair of pinnae often largest, lanceolate or broadly lanceolate, basiscopic lobes elongate or not; lateral pinnae not adnate to rachis, ± deeply lobed, with a tooth in each sinus between two lobes; veins free; lamina papery or herbaceous, both surfaces usually glabrous; rachises grooved adaxially, glabrous; costae raised on adaxial surface, glabrous or sometimes with sparse short hairs on adaxial surface. Sori terminal or dorsal on veins, medial, one line on either side of costules; indusia present, persistent or fugacious; perispore consisting of anastomosing wings. n = 41.
Seven species: tropical Asia, from NE India, Sri Lanka, and S China, to Indochina, Malaysia, Borneo, Indonesia, and the Pacific islands; three species (one endemic) in China.