Korea Flora: Habit: Evergreen perennial herb; similar to Dryopteris chinensis but distinguished by readily deciduous scales; leaves fasciculate at apex of creeping rhizome. Stipe: 15-30 cm long, scaly at base. Scales: Brown, lanceolate, 5-10 mm long, caducous. Blade: Pentagonal-ovate, 20-40 cm × 15-30 cm; apex abruptly narrowed and long-acuminate; tripinnate, deeply or completely divided. Pinnae: Oblong-lanceolate to triangular-broadly-lanceolate; long-stalked; basal pinnae asymmetrically triangular or triangular-broadly-ovate due to enlarged basal posterior pinnule. Pinnules: Oblong-lanceolate to oblong-ovate; very shortly stalked. Ultimate Segments: Oblong to oblong-lanceolate; margins with undulate, obtuse teeth. Sori: Located beneath sinus of teeth; indusium round-reniform, translucent membranous.

Note: Distinguished from Dryopteris chinensis by its caducous scales and pentagonal leaf shape.
Habitat: Growing in central and northern regions. 

[Translated from Flora of Korea by T.B. Lee]

Japan Flora: Rhizomes creeping, short to somewhat elongate; stipes slender, pale green, lustrous, 15-30 cm. long, nearly naked except for few scales near base; scales brown, lanceolate, 牛-8 mm. long; blades 5-angled, broadly ovate, 20-40 cm. long, 15-30 cm. wide, bipinnate, abruptly long-acuminate, nearly scaleless and smooth, the rachis pale green; pinnae 5-8 pairs, thick-herbaceous, spreading, the lower ones 리stinctly petiolu- late, broadly deltoid-lanceolate, the lowest subdeltoid with a dilated posterior side, the petiolules 2-5 cm. long; pinnules ob­long-lanceolate, 1.5-4 cm. long, 5-15 mm. wide, acute to obtuse, cuneate to truncate at base, pinnately lobed to parted, crenate, the lowest one 5-15 cm. long, 2-5 cm. wide, pinnatiparted to bipinnatiparted, petiolulate; sori near the sinus of the teeth, median or sometimes subcostal; indusia orbicular-reniform or reniform, hyaline, about 0.7 mm. across, erose-dentate.

Honshu (Kanto Distr. to Kai, s. Shinano, and Mikawa Prov.). Korea, China, and Manchuria.