Plants 60-90 cm tall. Sterile fronds: stipe dark brown like costae, 30-50 cm × ca. 3 mm, robust, glabrous; lamina 1-pinnate, ovate in outline, ca. 40 × 15 cm; lateral pinnae 3 or 4 pairs, opposite, basal pairs ca. 4 cm apart, extremely oblique, narrowly linear, 24-27 × ca. 1 cm, sessile, often slightly decurrent at base forming thin wings on basiscopic side, margin entire or slightly undulate, apex long acuminate (apical fertile parts 6-8 cm); basal 1 or 2 pinna pairs pinnate; terminal pinna with 2 or 3 pinnules, decurrent to lower pair of lateral pinnae at base; midvein raised abaxially, dark straw-colored or dark brown; veins approximate, spreading, simple or 2-forked.
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