Rhizome 1-3 cm thick, short-creeping, internodes up to 10 cm long. Anatomy: vascular bundles 20-30, equally sized, arranged in one row, without dark bundle sheaths, sclerenchyma strands absent. Rhizome scales squarrosely spreading, peltate, dimorphic, the elongated ones 1-6 by 1-2 mm, index 1-5, apex acute (rarely acuminate) to rounded, midrib present. Fronds dimorphic, glabrous, rachises not or rarely persistent. Base fronds contiguous, mostly overlapping, nearly entire to shallowly lobed, 5-10 by 4-9 cm, index 1-1.4. Foliage fronds stalked, stipe 5-15 cm long, conspicuously winged, lamina pinnatifid to 0.2-0.5 cm from costa, 30-70 by 12-25(-30) cm, index 2-3.5, apex aborted. Pinnae without or with a weak basal constriction, all equally long, 8-21 by 1-2.5 cm, index 5-12, margin entire, apex obtuse to acute-acuminate, free veinlets absent, simple or once forked, hydathodes absent. Sori in 2 irregular rows parallel to the veins, 2 or 3 in each main areole, round, 1-2 mm, slightly sunken. Sporangia glabrous. Spores with spines.
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