Rhizome much branched, hollow, 2-3 cm thick, forming compact balls to 15 cm across or spirally encircling branches, glabrous or with scattered small brown scales; with spines replacing many of the fronds. Phyllopods hollow, prominent, 6-9 mm high. Fronds monomorphic, stalked, entire to pinnatifid; stipe 2-8 cm long, 1-3 mm thick; lamina 15-40 by 2-7 cm, decurrent on the stipe, bright green, chartaceous. Pinnae perpendicular to the rachis or ascending, triangular, up to 3 cm wide at base, apex acute. Venation with recurrent freely branching included veinlets. Sori round to elliptic, 2-3 mm diam., sunken, forming pustules to 1 mm high on upper surface, in a single row on each side of the rachis or costae, to 7 on each pinna. Sporangia 0.3-0.4 mm long, on stalks to 0.5 mm long, spores 64, to 65 µm long.
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