Rhizome long-scandent, brown, 1-2 mm ø, deciduously scaly; scales honey-to fawn-coloured, narrowly triangular, to 2 mm long, to c. 16-seriate at the base, scarcely uniseriate at the apex. Leaves remote, c. 1-5 cm apart; petioles stramineous, or with brown base, adaxially flattened or sulcate, abaxially convex, rounded to obtusely bi-angular, extremely short to 4 cm long. Lamina linear, 20-50 cm long, 1.5-4 cm wide, tapering at both ends, with c. 50-80 pinnules to a side; rachis adaxially flattened or sulcate, abaxially bi-angular to broadly and shallowly sulcate. Pinnules herbaceous to chartaceous, dark green when dry, spreading or somewhat ascending, at least in the basal part of the lamina inserted somewhat below the level of the adaxial rachis face, often more remote in the lower part of the lamina, the larger ones 6 by 2 to 20 by 6 mm, 3 times as long as wide, almost evenly narrowed from base to apex, subtriangular; upper margin deeply incised, the primary segments 5-7, all but the smallest once, the largest twice bifid; lobes little divergent, linear to capillary, (0.3-) 0.5-1 mm wide, often seemingly narrower when dry because of the revolute margins, sometimes somewhat broadened at the sorus, the apex rounded; wing connecting the primary segments c. 0.25 mm wide at the narrowest points. Veins immersed, evident, single, rarely paired in larger, scarcely bifid lobes. Sori uninerval or very rarely binerval, one per ultimate lobe, mostly roundish; indusium pale, with straight or concave base, flattened-elliptic to hippocrepiform, 0.3-0.5 (-0.7) mm long, c. 0.2 mm wide, almost reaching the margin to not reaching it by more than its width, reflexed and ± concealed at maturity, the sporangia often spreading beyond the edges of the segment. Spores pale brown, trilete, smooth, c. 25 pl.
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