Stems to 4 m tall. Leaves 90-140 cm long, slightly keeled to flat in section (opposing pinnae inserted at 150-180° on rachis), with 160-220 pinnae, mid-green, semi-glossy. Petiole 17-28 cm long, spinescent for 5-90% of length. Median pinnae 14-19 cm long, 5.5-7.5 mm wide, narrowed to 4-5 mm at base (to 55-80% of maximum width), inserted at 60-75° to rachis, 9-11 mm apart, glabrous; margins slightly recurved; midrib flat above, raised below. Cataphylls narrowly triangular, soft, 6-8 cm long, densely orange-woolly or-floccose. Pollen cones c. 20 cm long, c. 9 cm diam. Microsporophyll lamina c. 35 mm long, c. 12 mm wide; apical spine c. 6 mm long. Megasporophylls 21-32 cm long, with 2-6 ovules; lamina lanceolate, 60-100 mm long, 17-32 mm wide, regularly dentate with 24-32 lateral spines 3-6 mm long and 1-2 mm wide; apical spine 12-16 mm long. Seeds 34 mm long, 30 mm wide.
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