Rhizome short-creeping, 1.5-2 mm ø; scales medium brown, narrowly to very narrowly triangular, to 1.25 mm long, to 6-seriate at base, with a long uniseriate apex. Leaves clustered; petioles sharply quadrangular almost throughout, reddish, abaxially in the upper part mostly pale-and somewhat wing-angled, rarely stramineous, 2-20 cm long, much shorter than to about equaling the lamina. Lamina linear, 8-22 cm long, 1-2.5 cm wide (wider if bipinnate), simply pinnate, or rarely with one pair of pinnae; rachis similar to the upper part of the petiole, abaxially nearly always distinctly wing-angled. Pinnules c. 6-30 to a side, ascending or the lower ones spreading, their width apart to contiguous, chartaceous, mostly olivaceous when dry, sub-trapezoidal to semi-ovate, the larger ones 7-12 (-15) by 3.5-6(-7) mm, twice as long as wide, rounded or subtruncate at apex, narrowed from the base to the rounded apex, or, especially if subtruncate, little narrowed, the outer margin often meeting the upper at an angle of less than 90°. Lower pinnules sometimes slightly remote; a few (more in larger leaves) upper pinnules rather suddenly but not strongly reduced, rarely less than half as long as the larger ones, the terminal segment narrowly rhombic to lanceolate, c. 0.5-1 cm long, free or almost so. Veins immersed, little evident, not very regularly anastomosing, with one (very rarely two) series of areoles, the outer veins often (in small pinnules sometimes all veins) free; areoles 0.5-0.75 mm wide. Sori continuous, uniting all vein-ends; indusium subentire, brownish, 0.3-0.4 mm wide, almost or quite reaching the margin, reflexed at maturity. Spores pale yellowish, trilete smooth, c. 22 μ.
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