Rhizome dorsiventrally somewhat flattened, up to 1 cm wide, short-creeping, the internodes up to 10 cm long. Anatomy: vascular bundles 15-20, c. 4 dorsal strands enlarged, arranged in one row, with or without dark bundle sheaths, sclerenchyma strands absent. Rhizome scales peltate, monomorphic, usually from a wide appressed base contracted into a narrow, subulate, squarrose acumen, dimorphic, elongate scales 1-8 by 0.5-2 mm, index 1-4, apex subulate, deciduous, dentate, midrib usually present, black. Fronds dimorphic, rachises not or rarely persistent. Base fronds contiguous, mostly not widely overlapping, sessile, nearly entire to shallowly lobed, 5-10 by 4-8 cm, index 1-1.4. Foliage fronds stalked, stipe up to 20 cm long, inconspicuously winged, lamina glabrous, pinnatifid to within 0.2 cm from costa, 20-45 by 12-25 cm, index 2-3, apex aborted. Pinnae with basal constriction, all equally long, 7-15 by 2.5-4.5 cm, index 3-4, margin entire, apex acute, acuminate to caudate, free veinlets simple or once forked, hydathodes absent. Sori in 2 irregular rows parallel to the veins, 1-2(-3) in each main areole, round, 1-2 mm, slightly sunken. Sporangia glabrous. Spores with spines.
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