Rhizome short-creeping, 1-2 mm ø; scales castaneous, narrowly triangular, to c. 1 mm long, to c. 7-seriate at the base, with a short uniseriate apex. Leaves close; petioles rather dark brown, faintly pale-margined, the greater part acutely, the base obtusely quadrangular, abaxially ± sulcate, c. 22-30 cm long, twice as long as the lamina. Lamina approximately rhombic in outline, 12-15 cm long, bipinnate, with 2 or 3 ascending pinnae to a side and a conform terminal one; rachis like the petiole, pale to medium brown. Pinnae linear, 9-12 cm long, 1-1.25 cm wide, widest above the base, long-acuminate, with c. 25-35 pinnules to a side; secondary rachises reddish brown, abaxially sharply bi-angular, stramineous-margined, hardly sulcate. Pinnules slightly ascending, not contiguous, chartaceous, olivaceous when dry, ligulate or more often 1/4-elliptic, the larger ones 5 by 2.5 mm, twice as long as broad; upper margin with 1 or 2 oblique incisions 0.5 mm deep or less; lobes with a slightly convex or the inner ones with a straight outer margin. Upper pinnules gradually and very strongly reduced, several minute, denticuliform ones confluent with the linear, very narrow pinna-apex. Veins immersed, ± evident, very close, regularly anastomosing, forming one series of areoles c. 1/3 mm wide. Sori interrupted by the incisions on the outer, sometimes also on the inner lobes (the material probably incompletely fertile), 2-to 8-nerval; indusium brownish, subentire, 0.3-0.4 mm wide, not reaching the margin by an approximately equal distance, scarcely reflexed at maturity. Spores yellowish brown, trilete, smooth, c. 20 μ.
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