Stems to 3 (-6) m tall. Leaves 70-110 cm long, moderately keeled (opposing pinnae inserted at 90-135° on rachis), with 120-170 pinnae, green, semi-glossy or highly glossy. Petiole 20-36 cm long, spinescent for 20-100% of length. Median pinnae 12-20 cm long, 5-7.5 mm wide, narrowed to 2.5-4 mm at base (to 40-60% of maximum width), inserted at 40-70° to rachis, 5-12 mm apart, glabrous; margins slightly recurved; midrib flat above, raised below. Cataphylls linear, pungent, 7 cm long. Pollen cones ovoid, 18 cm long, 7 cm diam., orange. Microsporophyll lamina 32 mm long, 11 mm wide; apical spine 5-8 mm long. Megasporophylls 14-25 cm long, with 2-4 ovules; lamina narrowly triangular, 40-70 mm long, 15-32 mm wide, regularly dentate with 18-26 lateral spines 3-6 mm long and 1-2 mm wide; apical spine 8-20 mm long. Seeds 38-50 mm long, 35-45 mm wide.
Scattered and localised in sandy to clay-loam soils over various substrata, usually on sloping country in wet eucalypt forests or rainforests; occurring in locally more mesic microhabitats, becoming quite sporadic and occurring further inland in the south of the range.
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