Stems to 5 m tall. Leaves 95-150 cm long, moderately keeled (opposing pinnae inserted at 90-140° on rachis), with 108-200 pinnae, dark green, semi-glossy. Petiole 20-43 cm long, unarmed. Median pinnae 15.5-25 cm long, 7-9 mm wide, narrowed to 2.5-4 mm at base (to 30-45% of maximum width), inserted at 40-50° to rachis, 10-17 mm apart, glabrous; margins slightly recurved; midrib flat above, raised below. Cataphylls narrowly triangular, soft, 4-7 cm long. Pollen cones ovoid, 30-35 cm long, 13-15 cm diam., brown. Microsporophyll lamina 40-42 mm long, 13-15 mm wide; apical spine 11-16 mm long. Megasporophylls 10-12 cm long, with 2-4 ovules; lamina ovate, 50-65 mm long, 38-50 mm wide, regularly dentate with 22-36 lateral spines 3-4 mm long and 1-2 mm wide; apical spine 19-30 mm long. Seeds 32 mm long, 28 mm wide.
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