Leaves monomorphic, dying back in winter, 25--90 × 15--30 cm. Petiole 1/3 length of leaf, scaly at least at base; scales scattered, brown, sometimes with darker patch at base. Blade light green, deltate-ovate, 3-pinnate-pinnatifid, herbaceous, not glandular. Pinnae in plane of blade, lanceolate; basal pinnae deltate to broadly lanceolate, not reduced, basal pinnules equal to adjacent pinnules, basal basiscopic pinnule much longer and 2 times width of basal acroscopic pinnule (only in this species); pinnule margins toothed, teeth spine-tipped. Sori midway between midvein and margin of segments. Indusia usually lacking glands. 2 n = 164.
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