Stems to 5 (-8) m tall. Leaves 60-110 cm long, slightly keeled to flat in section (opposing pinnae inserted at 130-180° on rachis), with 90-170 pinnae, pale green or blue, semi-glossy, when new, ageing to glossy green. Petiole 18-40 cm long, unarmed (or with few distal spines). Median pinnae 6-17 cm long, 4.5-8.5 mm wide, narrowed to 2.5-4 mm at base (to 40-70% of maximum width), inserted at 45-60° to rachis, 4-12 mm apart, glabrous; margins flat; midrib raised above and below. Cataphylls linear, pungent, 6-10 cm long. Pollen cones ovoid, 10-18 cm long, 9-11 cm diam., orange. Microsporophyll lamina 25-35 mm long, 14-16 mm wide; apical spine 8-11 mm long. Megasporophylls 16-22 cm long, with 2-4 ovules; lamina lanceolate, 40-65 mm long, 17-28 mm wide, regularly dentate with 12-30 lateral spines 1-5 mm long and 1-2 mm wide; apical spine 15-20 mm long. Seeds 38-45 mm long, 36-40 mm wide.
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