Korea Flora: Habit: Evergreen perennial herb; leaves fasciculate.
Stipe: 20-30 cm long, densely scaly along with rachis.
Scales: Reddish-brown to brown, membranous, entire; base with spine-like projections; linear-triangular to lanceolate-triangular; smaller ones ovate-triangular; apex long-acuminate.
Blade: Ovate to oblong-ovate; apex acute; 30-60 cm × 20-30 cm; bipinnate; widest at base.
Pinnae: Linear-lanceolate; shortly stalked; apex acute.
Pinnules: Oblong-ovate; apex rounded or obtuse; base acute or rounded, broader on both sides; adaxial surface glabrous; abaxial costa with both bullate and flat scales.
Sori: Submarginal, sometimes medial; indusium round-reniform with entire margins.
Related Taxa: f. kinkiensis Kurata:
Distinguished by dark brown scales on stipe and rachis
Habitat: Growing in Jeju Island.
Note: Characterized by spine-like projections at scale bases and mixture of bullate and flat scales on abaxial costa.

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