Falcatum is the word for sickle-shaped.
Rhizome: erect, massive, with several fronds at apex, scales ovate to oblong-lanceolate, acuminate, dark brown, paler near margin, papery, usually about 1.
Frond: 60 cm high by 25 cm wide, evergreen, monomorphic, blade/stipe ratio: 3:2.
Stipe: scales orange-brown, ovate, vascular bundles: 4 or more, in an arc.
Blade: 1-pinnate, oblong-lanceolate, leathery, glossy, bright green, glabrous above, wooly scales below early, then falling.
Pinnae: 4 to 12 pair, to 12 cm, sometimes eared at the base on the upward edge, pointed at the tip,apical pinna not larger; margins often undulate or coarsely and irregularly dentate; veins netted.
Sori: round, dispersed on the lower surface of pinnae throughout or sometimes confined to the upper pinnae, indusium: peltate, brown, sometimes blackish center, persistent, central, sporangia: brown.
Habitat: sunny lowlands, often along sea coast.
Distribution: Japan, Korea, China (eastern and southern parts), Vietnam, India.
Hardy to -15°C, USDA Zone 7.
Polypodium falcatum Linnaeus
Aspidium falcatum (L.) Sw.
Polystichum falcatum (L.) Diels