Rhizome much branched, hollow, 2.5-3.5 cm thick, forming clusters up to 25 cm across, densely covered with pointed spines up to 6 mm long. Phyllopods not prominent. Fronds mono-to dimorphic, stalked. Sterile fronds simple, fertile deeply lobed; stipe 10-20 cm long, 2-5 mm thick; lamina 24-90 by 3-4 cm, decurrent on the stipe, mid-green, chartaceous. Venation with recurrent free veinlets. Sori round, 2-5 mm diam., deeply immersed on the lamina in one row on each side of the rachis in the upper 2/3 of the lamina. Sporangia on stalks to c. 0.8 mm long; spores 64, to 70 µm long.
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