Caudex short, suberect; fronds strongly dimorphous. Sterile frond: stipe 20-35 cm long (Copeland); lamina to 36 cm long; pinnae one pair, to 22 cm long, 4.5 cm wide, narrowed to base and apex, margins ± sinuous, a basiscopic lobe 14 x 3.5 cm arising 3 cm above its base; rest of frond lobed to a narrow wing on each side of the rachis, the lobes 3 pairs, narrowed at their bases, apex of lamina conform with the upper lobes, the basal lobes 21 × 4.5 cm with short basiscopic lobules like the lobes of basal pinnae but shorter. Fertile frond: stipe to 50 cm long (Copeland); lamina to 30 cm long, divided as sterile frond but its lobes and pinnae not over 4 mm wide; pinnae of type 19 cm long with lobes 13 cm long; venation consisting of few narrow areoles, the veins bearing densely packed spongia throughout, so that the lower surface appears to be covered by them.
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