Rhizome creeping, hollow with a double gallery-system, 3.5-4.5 cm thick, straight or somewhat spirally creeping on trees, densely covered with sharply pointed spines 2-8 mm long. Phyllopods solid, not prominent, to 2 mm high. Fronds monomorphic, stalked, deeply pinnatifid; stipe 4-15 cm long, 2-5 mm thick; lamina 25-55 by 4.5-7 cm, decurrent on the stipe, dark green, coriaceous, blackish when dried. Pinnae slightly ascending, 0.8-1.6 cm wide, apex rounded. Venation with recurrent free veinlets, veins strongly sclerified, prominent, appearing black. Sori round, 3 mm diam., immersed in unreflexed marginal lobes, 5-12 on each pinna. Sporangia on stalks c. 0.9 mm long; spores 64, to 65 µm long.
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