Rhizome 8-10 mm in diam., sparsely scaly; scales ovate-lanceolate, ca. 3 mm, peltate, clathrate, base rounded, margin irregularly toothed, apex acuminate. Stipe straw-colored, 35-100 cm, up to 10 mm in diam. near base, glabrous, upper portion winged. Lamina pinnatifid or pinnatisect at lower portion, oblong in outline, 40-100(-130) × 25-30(-50) cm; lateral lobes (10-)20-30(-40) pairs, ascending, linear-lanceolate, usually 8-12 × 1-2.5 cm, herbaceous or leathery, both surfaces glabrous, base slightly narrowed and decurrent to rachis, margin entire or crisped, apex acuminate or obtuse; lateral veins and veinlets obscure, areoles with included veinlets. Sori orbicular to ellipsoid, in 1 row on each side of midrib, slightly nearer to midrib, abaxially sunken and adaxially raised.
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A fern that grows in marshes. It grows 35-100 cm tall. It has a long creeping fleshy rhizome. This is 8-10 mm across. It branches several times. There are many dark brown small roots. The leaves are alternate and erect with long leaf stalks. They are divided into lobes along the leaf stalk and the divisions almost meet the midrib. The leaves are 35-270 cm long and 10-60 cm wide. The lobes are narrow from a broad base. They are rough and are 5-35 cm long and 1-3 cm wide. The spore bodies or sori are in lines either side of the midrib.
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