Rhizome long-scandent, brown, 1-2 mm ø, dorsally ± persistently scaly; scales honey-coloured to pale golden-brown, narrowly triangular, to c. 25-seriate at base, to 4 by 1 mm, the uniseriate apex of up to 10 cells. Leaves 1-3 cm apart, issuing under an acute angle; petiole almost wanting to c. 2 cm long, stramineous, darker and verruculose at base, sharply quadrangular almost to the base, laterally and sometimes also adaxially broadly and shallowly sulcate. Lamina linear, 20-35 cm long, 1.5-2.5 cm wide, simply pinnate, with c. 40-60 pinnules to a side; rachis stramineous, abaxially flat, sharply bi-angular, adaxially broadly sulcate, laterally ± sulcate. Pinnules regularly spaced except at the base, not contiguous, spreading or mostly somewhat ascending, at least the basal ones inserted below the level of the adaxial-lateral ridges, asymmetrically elongate-triangular, herbaceous, bright green to olivaceous when dry, the largest 10-12 by 4-5 mm, ± evenly narrowed from base to apex, cuneate at base, narrowed-rounded at apex; lower margin mostly somewhat convex; upper margin outward convex, incised, with mostly 3 major, oblique incisions reaching down to 1/3 or 1/2 or occasionally to 3/4, the lobes not parallel-sided but narrowed, rounded at apex, the largest lobes shallowly incised again. Pinnules of juvenile plants and sterile ones not more incised. Lower pinnules gradually remote and reduced, largely sterile; upper pinnules gradually and strongly reduced, confluent into a pinnatifid leaf-apex. Veins immersed, evident, simple or once forked. Sori one per lobe, on the ends of 1 or 2 connivent veins; indusium transversely elongate to hippo-crepiform, with ± concave base, free at the narrowed sides, 1/3-1 mm long, c. 1/3 mm wide, not reaching the margin by its width or a little less, reflexed and concealed at maturity. Spores pale brown, trilete, nearly smooth, c. 22 μ.
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