Rhizome 2-6 mm diam., densely scaly. Scales ovate, 3.5-9.5 mm long, 1-2.2 mm wide, spreading, dark brown to black; margins often with a few irregular teeth, especially towards the base; apices long-attenuate. Stipe (0-) 1-4.5 (-13.5) cm long. Fronds linear, 3.5-90 cm long, 0.5-2 cm wide, pendulous or erect, thick, brittle; base tapering gradually into the stipe; margins undulate or entire; apex bluntly acute or obtuse. Sori elliptic or oblong, rarely round, varying from c. half-way between midrib and margin to almost marginal. Spores 50-75 µm long, 30-47.5 µm wide.
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