Korea Flora: Habit: Evergreen perennial herb; leaves fasciculate at apex of thick, short rhizome.
Stipe: 20-50 cm long, densely scaly.
Scales: Linear to linear-lanceolate; margins entire; brown to dark brown; becoming narrower and shorter upwards, readily deciduous.
Blade: Oblong to ovate-oblong; apex acute; 30-70 cm × 20-30 cm; bipinnate; adaxial surface glossy.
Pinnae: Lanceolate to oblong; apex caudate; shortly stalked; abaxial rachis with bullate scales.
Pinnules: Oblong to linear-lanceolate; apex rounded or acute; margins shallowly serrate.
Sori: Arranged in single row; indusium round-reniform with entire margins.
Distinctive Features: Young leaves and indusia with reddish-purple tinge
Related Taxa: var. ambigens Nakai, Sori confined to upper half of pinnules, More deeply serrate margins
Habitat: Growing in forests of southern islands and Ulleung Island.
Note: Distinguished by glossy surface, caudate pinna apex, and reddish-purple young parts.

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