Stems to 4 (-7) m tall. Leaves 70-110 cm long, slightly keeled to flat (not keeled) in section (opposing pinnae inserted at 130-180° on rachis), with 160-240 pinnae, green (slightly bluish), dull. Petiole 20-45 cm long, unarmed. Median pinnae 7-12 cm long, 6-8 mm wide, narrowed to 3.5-5.5 mm at base (to 60-80% of maximum width), inserted at 60-90° to rachis, 5-8 mm apart, glabrous; margins flat; midrib raised above and below. Cataphylls linear, pungent, 6-9 cm long. Pollen cones ovoid, 11-18 cm long, 8-12 cm diam., orange. Microsporophyll lamina 25-29 mm long, 14-17 mm wide; apical spine 7-11 mm long. Megasporophylls 17-22 cm long, with 2-4 ovules; lamina lanceolate, 45-75 mm long, 18-30 mm wide, regularly dentate with 18-24 lateral spines 1-3 mm long and 1 mm wide; apical spine 8 mm long. Seeds 40 mm long, 30 mm wide.
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