Rhizome slender, long creeping, 3-5 mm in diam.; scales narrowly ovate or triangular, 1.5-6.6 × 1-1.7 mm, margin denticulate, apex long acuminate to hairlike. Fronds not or only slightly dimorphic; stipe stramineous, 20-30 cm; lamina pedately divided, trifid, unequally trifid, or simple, 8-18 × 8-26 cm, widest below middle, thinly herbaceous, base cuneate-decrescent to cuneate, margin entire or undulate; longest lobes widest below middle; apical lobe 10-18 × 1.5-4 cm; veins ± sunken and indistinct, or prominent and distinct, free included veinlets simple or once forked. Sori linear, 1 row between each pair of lateral veins, superficial or slightly sunken, on whole surface of lamina.
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