Korea Flora: Habit: Evergreen herb; leaves densely arranged at apex of short, thick rhizome.
Stipe: 15-30 cm long, densely scaly along with rachis.
Scales: Dark brown to blackish-brown; broadly lanceolate to linear, becoming narrower and shorter towards apex; rachis scales spreading or reflexed, with small protuberances.
Blade: Broadly lanceolate, apex acute, base truncate, 40-60 cm × 15-22 cm; bipinnate, deeply or completely divided.
Pinnae: Lanceolate, 1-3.5 cm wide; abaxial costa sparsely scaly; shortly stalked; more deeply divided towards base with separate pinnules.
Pinnules: Elongate-oval; apex rounded or obtuse; margins serrulate; lateral veins forked in pairs.
Sori: Arranged in upper portion; medial; indusium round-reniform with entire margins.
Note: f. coreana H. Ito is distinguished by obtuse pinnule apices and is found in Wando.
Habitat: Growing in central and southern regions.

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

 

Japan Flora: Rhizomes stout, short, erect; fronds evergreen; stipes 15-30 cm. long, stout, densely scaly; scales black-brown, linear to lanceolate, 1-2 cm. long, spinulose on margin or nearly entire, lustrous, spreading to deflexed, unequal, the larger ones some­times paler on upper half, the basal ones often brown and entire; blades herbaceous, broadly lanceolate to oblong-ovate, 40-60 cm. long, 15-22 cm. wide, acuminate, not or scarcely narrowed at the truncate base, bipinnatipartcd to somewhat bipinnate, the scales on rachis linear to linear-lanceolate, spreading to deflexed, spinulose; pinnae rather numerous, spreading, lanceolate, the sterile broadly so, 2-3.5 cm. wide, often linear-lanceolate, the fertile about 1 cm. wide, with small appressed scales beneath especially on costas, glabrous above; pinnules oblong to broadly oblong-lanceolate, 4-7 mm. wide, rounded to obtuse, the lowest pinnule of the lower pinnae often much contracted and snbsessile at base, the veinlets forked or simple; sori covering of blade; indusia orbicnlar-reniform, entire, 0.7-1 mm. across.  Woods in mountains.

Hokkaido (Okushiri Isl.), Honshu, Shikoku, Kyu­shu. s. Korea and China.