Summer-green. Rhizome stout, ascending to erect, covered with persistent stipe bases; scales thin, rusty-brown, ovate-lanceolate, 203 mm long 0.5 mm broad. Stipe much shorter than lamina, tufted, slender, stramineous sometimes purplish, 3-20 cm long; lamina narrowly lanceolate, deeply bipinnatifid to bipinnate (basal pinnules free), 10-20 cm long, 3-6 cm wide; all except upper pairs of pinnae reflexed, 2-4 cm long, sessile; pinnules cut nearly to costa, obtuse, dentate, adaxial basal pinnule enlarged, herbaceous, glabrous, fertile even in small leaves; ultimate segments oblong to elliptic, serrate or sharply lobed at margin; very short spines present on the adaxial side of costae. Sori medial or basal on lower veinlets; indusia oblong, J-shaped or reniform; margins somewhat erose.
Taiwan, Japan, Shikoku and Kyushu (Yakushima), and S. Korea.
Habitat: Edge of forest or side by the trail, Understory of Forest
Leaf shape: Lanceolate
Apex of Leaf: Acuminate
Leaf Division: Bipinnatifid
Length of Stipe: 7 (5-15)
Length of Lamina: 15 (5-20)
Width of Lamina: 7 (3-15)
Stipe Color: Stramineous
Free Pinnulate in basal Pinnae: No
Form of basal Pinnulate arrangement: Opposite
Apex of Pinnae: Acute
Petioled in pinnae: Sessile
Length of Lowest Pinnae: 3 (1-5)
Wideth of Lowest Pinnae: 1 (0.5-3)
Lowest pinnae with enlarged basiscopic pinnules (more than 3 mm): No, less than 3 mm
Apex of terminal fragment: Round or Obtuse
Margin of terminal fragment: Serrulate, Denticulate
Type of Basal of Pinnule: Broadly adnate
Anterior pinna or pinnule auriculate: not auricaulate
Lowest Pinnae with shorter basal pinnule: No, basal pinnule similar with next two pinnules
Second Lowest Pinnae with shorter basal pinnule: No, Basal Pinnulate similar with next two
Abaxial Surface of Rachis with Unicellular Hairs ?: Yes, densely coved with unicellular hairs (pubescent)
Abaxial Surface of Rachis with Gland Hairs?: Yes, there are rare gland hairs on rachis
Abaxial Surface of Coaste with Unicellular Hairs ?: Yes, densely coverd unicellular hairs on costae (pubescent)
Type of Adaxial Costae Spines: None, Short spines
Spines Existing on Adaxial Costulate: No, spines Absent on costulate
Type of Scales on Basal Stipe: Lanceolate
Color of Scales on Basal Stipe: Yellow Brown
With Adventitious Bud near the Apex of Leave: No, adventitious buds absent
Sori Shape: Short straight, Curved
Sori Position: Closed to midrib
Type of Rhizome: Short Erect
Geographic Distribution: Taiwan - Japan
Altitude: 2800 (2500-3300)
