Stems to 2 (-5) m tall. Leaves 120-170 cm long, moderately keeled (opposing pinnae inserted at 90-135° on rachis), with 160-240 pinnae, grey-green or blue, dull. Petiole 28-60 cm long, spinescent for 20-50% of length or rarely unarmed. Median pinnae 17-27 cm long, 6-7.5 mm wide, narrowed to 4-5 mm at base (to 55-75% of maximum width), inserted at 40-50° to rachis, 9-13 mm apart, glabrous or tomentose; margins slightly recurved; midrib flat above, raised below. Cataphylls linear, pungent, 7-10 cm long. Pollen cones subglobose, 21 cm long, 13 cm diam., yellow. Microsporophyll lamina 50-55 mm long, 20 mm wide; apical spine 28 mm long. Megasporophylls 28-32 cm long, with 4-6 ovules; lamina lanceolate, 45-80 mm long, 18-22 mm wide, regularly dentate with 24-30 lateral spines 0.5-2 mm long and 1 mm wide; apical spine 16-32 mm long. Seeds 36-39 mm long, 28-32 mm wide.
The Lawn Hill Creek occurrence is on limestone or alluvium derived from limestone, in exposed situations along small, open creek valleys. The Wollogorang occurrences are small relictual stands in sandy alluvium in gorges in siliceous sandstone.
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