Rhizomes erect, cylindrical, ca. 2 cm, annually producing 1 or 2 fronds 15-60 cm tall. Sterile lamina: stalk (4-)13-35 cm, sparsely lanuginose; lamina subternate, tripinnate, deltoid-pentagonal, 8-35 × 8-40 cm, thickly herbaceous; pinnules broadly lanceolate, apex acute; ultimate segments elliptic, irregularly roughly serrate, apex obtuse or subacute; veins pinnate, free. Sporophore arising (2-)6-15 cm below top of common stipe (or near middle of common stipe); stalk 7-20 cm; lamina deltoid, 5-18 cm, bipinnate; sporangia globose, attached on both lateral sides of axes. Spore surface with dense papillae often uniting in reticulate pattern, with minute granules. 2n = 180.
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