Perennial. Rhizome slender, creeping below ground. Leaves 25-80 cm, not tufted, long-petioled, with glabrous, shining petioles; blade oblong-lanceolate in outline, not glandular, sparsely hairy when young, 1-pinnatisect; segments 10-30 on either side, oblong-lanceolate to linear, pinnatipartite into oblong, acute, entire or slightly repand lobes, those of fertile leaves with somewhat reflexed margin. Sori small, arranged halfway between main vein and margin, later becoming confluent; indusium caducous. May-June.