Stems to 2 (-4) m tall. Leaves 80-125 cm long, flat (not keeled) in section (opposing pinnae inserted at 180° on rachis), with 140-210 pinnae, grey-green to dark green, semi-glossy (when mature). Petiole 8-20 cm long, spinescent for 5-50% of length (often only 2 or 3 distal spines). Median pinnae 9-18 cm long, 5.5-9.5 mm wide, narrowed to 4-6.5 mm at base (to 65-75% of maximum width), inserted at 70-80° to rachis, 6-13 mm apart, tomentose; margins flat or slightly recurved; midrib flat above, raised below. Cataphylls narrowly triangular, soft, 7-13 cm long. Pollen cones narrowly ovoid, 18-24 cm long, 7-9 cm diam., orange to brown. Microsporophyll lamina 25-35 mm long, 11-15 mm wide; apical spine 5-11 mm long. Megasporophylls 17-24 cm long, with 2-6 ovules; lamina lanceolate, 50-90 mm long, 14-19 mm wide, regularly dentate with 6-20 lateral spines 2-4 mm long and 2-3 mm wide; apical spine 20-35 mm long. Seeds 27-31 mm long, 26-30 mm wide.
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