Stems long-creeping, 2--4 mm diam. Leaves monomorphic, dying back in winter, often 1--2 cm apart, ca. 25--75 cm. Petiole straw-colored, (7--)20--45 cm × 1.5--3 mm, at base with scales tan, lanceolate, glabrous or marginally hairy. Blade broadly deltate, about as broad as long, (8--)15--33 cm, proximal pinnae longest and narrowed at base, usually spreading or slightly ascending. Pinnae 7--20 × 2--6(--8) cm, all connected by wing along rachis, deeply pinnatifid; segments entire or largest pinnatifid about halfway to costule; proximal pair of veins from adjacent segments meeting margin above sinus, veins often forked. Indument abaxially of moderately to densely set hairs mostly 0.1--0.25 mm along costae and veins, also of yellowish stalked glands 0.1 mm on veins and blade tissue, costae with whitish to light tan, narrowly lanceolate, spreading, marginally hairy scales to ca. 1.5 mm. Sori subterminal on veins. 2 n = 60.
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