Rhizome short-creeping, 1-1.5 mm ø; scales medium brown, elongate-triangular, to c. 1.25 mm long, to c. 10-seriate at base, with a short uniseriate apex. Leaves clustered; petioles medium to dark brown (rarely pale), in large leaves longer than the Irmina, and abaxially mostly obtusely bi-angular, in small leaves shorter than the lamina and abaxially sharply bi-angular, pale-edged or not, 6-45 cm long. Lamina simply pinnate or bipinnate (very rarely subtripinnate), if bipinnate with up to 3 pinnae to a side and a conform terminal one, c. 15-20 cm long, if once pinnate, c. 8-15 by 1.5-2 cm. Primary rachis (if any) like the petiole. Pinnae 10 by 1.5 to 18 by 3 cm; pinnule-bearing rachises stramineous to dark brown, abaxially sharply bi-angular, pale-edged or not, ± sulcate. Pinnules c. 25-30 to a side, spreading, ascending, or fsdcately decurved, their width apart to slightly overlapping, 1/4-elliptic to falciform, 5 by 2 to 15 by 5 mm, 2.5-3 times as long as wide, dark green to blackish when dry, chartaceous; apex of pinnules narrowed-rounded to very obtuse, a distinct outer margin not de-veloped. Upper pinnules gradually and strongly reduced, several denticuliform ones confluent into a narrow pinnatifid leaf-or pinna-apex. Veins slightly impressed on the adaxial and prominulous on the abaxial side, once or twice forked, anastomosing to form an incomplete series of areoles %-1 mm wide, the outer veins often free, in small (rarely in larger ones) pinnules the veins may be quite free. Sterile margin sinuate-dentate, fertile margin mostly crispate. Sori continuous in fully fertile pinnules; indusium delicate, pale, subentire, sometimes crispate, 0.3-0.5 mm wide, not reaching the margin by 1/2-1 times its width, reflexed and often concealed at maturity, the fertile margin sometimes revolute over part of the sorus. Spores pale brown, trilete, smooth, 20-22 μ.
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