Rhizome dorsiventrally flattened, 2-6 mm wide, short-to medium-creeping, internodes 0.8-4 cm long, not white waxy, roots densely set. Vascular strands c. 5, rarely with weakly sclerified sheaths, sclerenchyma strands 15-100. Rhizome scales pseudopeltate, sparsely to densely set, slightly spreading, narrowly ovate or triangular, 2.5-4 by 0.5-1 mm, clathrate or subclathrate, margin denticulate, glabrous or central region bearing multiseptate hairs. Fronds not or slightly dimorphic, pinnately dissected, stipitate, thin-herbaceous. Stipe 5-56 cm long, 1.2-6.2 mm thick; lamina pinnatifid or pinnate, ovate, 12-60 by 12-50 cm, index 1-2, widest below the middle, base truncate or truncate-angustate, lower surface without acicular hairs. Lobes 2-12 at each side, basal lobes sometimes stalked, longest lobes at position 1-2(-4) from base, connected by a 0.1-0.6 cm wide wing, 8.5-26 by 0.8-4.5 cm, index 7-20, widest about the middle; apical lobe longer than upper lateral lobes, 8-23 by 1-2.6 cm, widest about the middle. Venation: veins more or less immersed and indistinct to prominent and distinct, 4-9 mm apart, zigzag, dichotomously branched near the margin, or (in fertile fronds) veins branching at or near the costa, each costal areole giving rise to a sterile and a fertile vein; connecting veins 2 or 3, anadromous, forming more or less equally sized, sometimes irregularly shaped, areoles, sometimes also a row of small primary costal areoles; included veins more or less immersed and indistinct to prominent and distinct, free veinlets simple or once forked. Sori forming transverse coenosori between each pair of veins.
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Rhizome slender, long creeping, 2-10 mm in diam., somewhat flattened; scales dark brown, ovate-lanceolate, 1.1-7.6 × 0.6-2.3 mm, margin sparsely denticulate, apex acuminate. Fronds subdimorphic, distant; stipe stramineous, 6.5-48 cm; rachis usually winged, to 3.2 cm wide; lamina pinnate to deeply pinnatifid, oblong-ovate or ovate-lanceolate in outline, 17-70 × 8-22(-50) cm, herbaceous to papery, dark brown, glabrous, base narrowly cuneate and decurrent, margin entire to distinctly undulate-repand; lobes 3-14 pairs, linear to narrowly lanceolate or elliptic, 4.5-24 × 0.9-3.8 cm, apex long acuminate; fertile fronds usually with longer stipes, narrower pinnae or lobes, papery; lateral veins often rather crooked and ill defined, forming 2 or 3 irregularly arranged areoles, free included veinlets often forked. Sori linear, sometimes interrupted, one between each pair of lateral veins. 2n = 72.
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