Sterile fronds pinnate, 60-75 cm long; lamina index 1-2, 30-40 by 20-24 cm, terminal segment 12-20 cm long, herbaceous, with a spherical subterminal bulbil; pinnae 8-16, index 3-5, 13.5-15 by 3-4 cm, base either ± symmetrical, broadly cuneate to subcordate, or asymmetrical with its basiscopic side longer and/or wider than its acroscopic side, margin entire or (in part) slightly sinuate; terminal segment ± conform to the pinnae or triangular with 1-2 basal lobes; venation pattern very intricate, reminiscent of that of B. heteroclita but part of the areoles with usually one excurrent included free vein, see Fig. 27k. Fertile fronds 60-85 cm long; lamina index 2-4, pinnae index 5-8, 5-6 by 0.7-1 cm. Sporangia all over the lower surface. Spores with a smooth cristate perispore.
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