Rhizome rather short-creeping, 2-3 mm ø; scales castaneous, lanceolate, long-acuminate, to 2.5 mm long, to c. 10-seriate at base. Leaves close; petioles dark castaneous or atropurpureous, abaxially at least upward sharply bi-angular and pale-angled, c. 25 cm long, about as long as the lamina. Lamina oblong, simply pinnate, with 8-12 pinnae to a side and a conform terminal one; rachis like the upper part of the petiole or paler. Pinnae coriaceous, brown when dry, ascending, very narrowly lanceolate, acuminate, 10-15 cm long, 6-7 mm wide, unequally cuneate at the base, the margin shallowly and evenly crenate or sometimes bicrenate. Upper pinnae somewhat reduced; terminal pinna conform, smaller than the larger lateral ones. Costa prominent on the abaxial side, pale, flattish; veins immersed, not evident, close, very oblique, once forked, sometimes the posterior branch forked again. Sori uninerval, laminal or partly extending onto the largest lobes; indusium brown, subentire, 0.25 mm wide, 0.5-0.75 mm long, with convex free edge and ± convex base, 0.25 mm or farther from the margin. Sporangia strongly protruding at maturity. Spores abortive.
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