Stipe 65 cm long, nearly black, glossy, rachis similar; lamina c. 50 cm long, firm but not rigid, consisting of a trilobed apex and 3 pairs of pinnae; apical lamina 22 cm long, its midlobe 7.5 cm wide with obliquely shallowly lobed margins, lateral lobes c. 17 × 5 cm; middle pinnae 26 cm long (stalk 5-7 mm), their acroscopic bases cuneate at 45° and then rounded, basiscopic bases truncate to subcordate, 15 mm wide, then gradually wider, margins almost entire; basal pinnae 25 cm long (stalk 12 mm), bilobed, basiscopic lobe 19 cm long, abruptly short-acuminate, 5.3 cm wide, its basiscopic margin undulate-subcrenate in its widest part; main veins to 12 mm apart along costae, sinuous, upcurved, cross-veins irregular, smaller veins concolorous, distinct on both surfaces; lower surface wholly glabrous, upper surface minutely hairy on costae only; sori in a row on each side of main veins (no additional ones present), mostly not on free veins in areoles, somewhat impressed; indusia apparently peltate (all old and distorted on type).
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