Stems to 4 (-7) m tall. Leaves blue, dull, 75-120 cm long, strongly keeled (opposing pinnae inserted at 30-50° on rachis), with 90-136 pinnae. Petiole 10-23 cm long, unarmed. Median pinnae glabrous, inserted at 40-50° to rachis, 18-21 cm long, 3.5-5 mm wide, narrowed to 2.5-4 mm at base (to 70-80% of maximum width), 1-5 mm apart on rachis; margins recurved; midrib flat above, raised below. Cataphylls linear, pungent, 3-4.5 cm long. Pollen cones narrowly ovoid, orange or brown, 24-40 cm long, 8-9.5 cm diam. Microsporophyll lamina 2.8-3.8 cm long, 5-13 mm wide; apical spine 3-4 mm long. Megasporophylls 13-24 cm long, with 2-6 ovules; lamina ovate, 28-32 mm long, 20-25 mm wide, obscurely dentate; apical spine 5-15 mm long. Seeds 35-39 mm long, 32-35 mm wide.
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