Rhizome short-creeping, 1/2-2/3 mm ø; scales not seen. Leaves clustered; petioles abaxially obtusely to sharply bi-angular, 1-10 cm long, shorter than to about equaling the lamina. Lamina linear, once pinnate + deeply uni-to tripinnatifid, narrowed on both sides or truncate at the base, with c. 20-50 pinnules to a side; rachis abaxially sharply bi-angular, hardly sulcate. Pinnules subcontiguous to slightly overlapping, the basal ones farther apart, spreading, slightly ascending, or somewhat falcately decurved, thinly herbaceous, medium to dark green when dry, 5 by 2.5 mm to 3 by 1.5 cm, semi-ovate to suboblong in outline, 2-2.5 times as long as wide, very deeply incised from the upper margin, with 3-9 primary segments (in one plant at the apex also incised from the lower edge), these rarely all simple, mostly at least the basal ones once or twice forked, or in very large pinnules acroscopically-dimidiately or subequally pinnatifid, then some of the secondary segments again bifid; ultimate lobes ± divergent, linear, often with revolute margin, gradually but slightly broadened upward, then suddenly broadened at the sorus, the wing connecting them about as wide as the segments. Veins immersed, single or very rarely paired in the lobes. Upper pinnules gradually reduced, confluent into a pinnatifid leaf-apex; basal pinnules ± reduced. Sori uni-or binerval; indusium pale or greenish, delicate, subentire, laterally free, 1/4 mm wide, not reaching the margin by its width or a little less, not strongly reflexed at maturity but the sporangia often spreading beyond the margin. Spores pale brown, trilete, smooth, c. 20 μ.
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