Rhizome short-creeping, 2-3 mm ø; scales reddish brown, narrowly triangular, to 2 mm long, to c. 8-seriate at base, with a short uniseriate apex. Leaves close; petioles stramineous to pale brown, or darker with age, abaxially subterete, upwards obtusely or less often acutely bi-angular, 20-35 cm long, about equaling the lamina. Lamina oblong, c. 15-35 cm long, with 2-4 pinnae to a side and a conform terminal one (rarely simply pinnate but fertile); primary rachis similar to the upper part of the petiole, rarely shallowly sulcate. Pinnae obliquely ascending, sessile, 12-25 cm long, 1 1/2-2 1/2 cm wide, widest in the lower third or in the middle, gradually and strongly tapering at the tip. Secondary rachises abaxially terete at the base, upward gradually bi-angular, or bi-angular almost to the base, usually little sulcate. Pinnules c. 25-40 to a side, spreading or little ascending, mostly subcontiguous, rounded-trapeziform, the larger ones 9-15 by 4-7 mm, about twice as long as wide; apex rounded, but the outer margin distinct, especially from the lower, forming an angle of about 90° with the slightly convex upper margin. Margins entire, or shallowly crenate if sterile; texture firmly herbaceous, dark green and ± glossy above when dry, sometimes described as bluish in the living State. Upper pinnules strongly reduced, several denticuliform ones connected with the small, narrow terminal segment. Veins immersed, evident, not very oblique, regularly anastomosing, with one, occasionally part of a second series of areoles; larger areoles 1/2-1 mm wide. Sori in completely fertile pinnules continuous on upper and outer margin; indusium entire, 1/5-1/4 mm wide, not reaching the margin by an equal or slightly larger distance, reflexed at maturity. Spores medium brown, trilete, smooth, c. 22 μ.
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