Stems creeping, not cordlike, internodes short, heavily beset with old petiole bases, hairs absent; scales lanceolate, ± clathrate, radial walls dark brown, thick, luminae clear. Leaves monomorphic, clustered at stem apex, to 45 cm, nearly all bearing sori. Petiole green to straw-colored throughout or darker near base, shorter than blade, base sparsely scaly. Blade deltate to narrowly deltate, 2-pinnate-pinnatifid, usually widest at or near base, apex short-attenuate; rachis and costae with unicellular, gland-tipped hairs, misshapen bulblets present or absent; axils of pinnae usually with multicellular, gland-tipped hairs. Pinnae typically perpendicular to rachis, not curving toward blade apex, margins serrate; proximal pinnae pinnatifid to pinnate-pinnatifid, ± equilateral, basiscopic pinnules not enlarged; basal basiscopic pinnules sessile or short-stalked, base truncate to obtuse, distal pinnae ovate to oblong. Veins directed into teeth and notches. Indusia cup-shaped, apex truncate, with scattered, unicellular, gland-tipped hairs. Spores spiny, usually 39--48 µm. 2 n = 168.
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