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Rhizome 6–10 mm thick; lvs monomorphic, to 14 dm, the petiole purplish-brown, shining, the blade lance-oblong, to 5 × 2.5 dm, acuminate, pinnate-pinnatifid, the pinnae 15–20 pairs, pinnatifid with a rachis 1–1.5 mm wide, the segments 15–20 pairs, ovate to broadly oblong, with cartilaginous margins; veins forming a single series of areoles along the costa and costules, otherwise free, indusia thin, soon recurved, those along the costules only 1–1.5 mm, those along the costae larger; 2n=70. Swamps and moist places in acid soil; N.S. to Fla., w. to Ont., Mich., Ill., and Tex.; Bermuda. (Anchistea v.)
A fern.
