Rhizome short-creeping, 1-2 mm ø; scales medium brown, very narrowly triangular, to 1.75 mm long, to c. 5-seriate at base, with a long uniseriate apex. Leaves clustered; petioles stramineous, quadrangular, abaxially broadly and shallowly sulcate or flat below, (6-) 10-30 cm long, about as long as the lamina, or in small leaves shorter. Lamina simply pinnate or more often paucijugate-bipinnate, with one odd lateral pinna to 2 pairs and a conform terminal one; primary rachis like the petiole, abaxially often more sulcate. Lamina if simply pinnate c. 10-20 cm long and 3.25-4 cm wide, if bipinnate 18-30 cm long. Primary pinnae (if any) not strongly ascending, not close, 8-20 cm long, 2-4, often 2.5 cm wide, mostly rather abruptly acuminate. Pinnule-bearing rachises like the primary, or abaxially more sulcate. Pinnules herbaceous to chartaceous, pale to dark olivaceous when dry, rounded-subtrapeziform-ligulate or less often rounded-subrectangular, spreading or ± ascending, 12 by 4 to 20 by 6 mm, 2.5 to almost 3.5 times as long as wide; lower margin ± straight, upper margin often outward convex, outer margin rounded into the upper or meeting both lower and upper at approximately right angles, the pinnules then scarcely narrowed to the subtruncate apex. Upper margin with 3-5 narrow incisions to 1 mm, occasionally to 2 mm (1/3 of the width) deep, the lobes between them flattish, the largest rarely shallowly incised again; outer margin with 1 or without any incision; fertile margin often in addition minutely erose; sterile margin with the major incisions equally developed, the lobes crenate. Upper pinnules gradually or mostly rather abruptly reduced, some denticuliform ones confluent with the pinnatifid terminal segment; lower pinnules of simply pinnate leaves often more remote. Veins immersed or adaxially slightly prominulous, evident, once or twice forked, 0.5-1 mm apart, connivent, here and there anastomosing, or sometimes quite free, but most leaves at least with a few anastomoses, the row of areoles rarely complete in one pinnule. Sori interrupted by the incisions, 1-4 mm long, the one on the outer margin usually continuous with the outermost one of the upper; indusium greenish or brownish, subentire, 0.2-0.3 mm wide, not reaching the margin by an equal or larger distance, reflexed and often quite concealed at maturity. Spores very pale brown, trilete, smooth, c. 22-25 μ.
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