Rhizome erect, ascending, or shortly creeping. Fronds 2-pinnate, dimorphic, or rarely hemidimorphic, up to 150 × 50 cm; fiddleheads enveloped by pale reddish brown, long lax hairs, but glabrescent and naked in mature fronds; stipe green or straw-colored, terete, glabrous or glandular hairy when very young; sterile fronds oblong-subdeltoid, 30-50 × 25-40 cm, 2-pinnate; lowest pinnae largest, 20-30 cm; pinnules spreading, oblong-lanceolate to lanceolate, 5-10 × 1-2.5 cm, papery, base truncate to subtruncate, asymmetrical, sessile, margin minutely dentate, apex acute; veins all free, lateral veins joining main veins at ca. 50° angle; fertile fronds 2-pinnate; pinnules linear, 2-4 mm wide, covered throughout with sporangia except on costae, falling soon after spore dispersal. 2n = 44.
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A fern. It is a large fern. It has 2 kinds of fronds. The blades are twice divided. They are 4-6 cm long by 2 cm wide. The fertile fronds are narrow and covered with brown spore bodies.