Rhizome short, erect to suberect or curved, thick with many stipe bases. Stipes stramineous or brownish, of sterile fronds (4.5-)15-25(-35) cm long, of fertile fronds (17-) 40-50(-65) cm long, base slightly to moderately enlarged, 2-7 mm wide in the middle, in cross section one V-shaped vascular bundle, upper part of stipe tetragonal or rarely triangular, aerophores only present on base of stipe; rachises glabrous. Fronds not covered with an amorphous gelatinous mucilage layer when dry, dorsal side of rachis semiterete to trigonous, not winged, rachis (0.5-)1-1.5(-3) mm wide in the middle part. Sterile lamina herbaceous, not glaucous, pinnatifid, rarely except a few free basal pinnae, widest basally to medially, (8-)15-25(-36) by (3-)5-15(-26) cm, index (1.3-) 2(-3.5); pinnae (8-)13-20(-35) pairs, widest below or about the middle, veins of pinnae paired at base, forked above base, or rarely simple, distinct on both surfaces, stomata scattered on the lower epidermis, margin minutely serrulate but towards the base becoming entire or nearly so or nearly entire except the apex, most pinnae except the uppermost with inequilateral base, acroscopic side adnate into a wide wing along the rachis; lowermost pinnae adnate, not or slightly deflexed, not or slightly shortened; middle pinnae (1.5-)5-7(-11) cm long, (0.4-)0.7-1.2(-1.7) cm wide in the middle, acroscopic side of base adnate to the rachis into a wide wing, basiscopic side rounded, partly free from rachis; uppermost pinnae adnate, base about equal-sided, basiscopically decurrent into rachis wing; apex of lamina pinnatifid, terminated by a pinnatilobed, short-or long-triangular segment. Fertile fronds usually longer than the sterile ones, dorsal side of rachis flattened or slightly grooved, not winged, rachis (0.5-)1(-2) mm wide in the middle part; lamina pinnate except the apex, lower pinnae shortly stalked, (8-)16-26(-45) by (2-)4-10(-16) cm; pinnae glabrous or sparsely bearing short glandular hairs, (9-)13-17(-24) pairs, margin entire or subentire; lowermost pinnae not shortened, 1-4 cm apart; middle pinnae (1-)4-8(-11) cm long, 2-3(-4) mm wide, base sessile or shortly stalked; apex terminated by a pinna conform to the lateral one and often beaded at the base or pinnatifid, acuminate, or caudate. Paraphyses many or few, rarely mostly lost, yellow to brown. Spores yellow, with reddish tubercles.
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Stipes (4.5-)15-25(-35) cm on sterile fronds, (17-)40-50(-65) cm on fertile fronds, distally tetragonal or rarely triangular in cross section; vascular bundle V-shaped; stipes and rachises glabrous; aerophores cushionlike, present only on stipe base. Sterile lamina pinnatifid, (8-)15-25(-36) × (3-)5-15(-26) cm, not glaucous, apex confluent, terminating in a pinnatilobed segment; rachises abaxially semiterete to trigonous; pinnae (8-)13-20(-35) pairs; proximal pinnae adnate to rachises, not deflexed to subdeflexed, not abbreviated or slightly shortened; middle pinnae acroscopically adnate to rachises, basiscopically rounded; distal pinnae subequilaterally adnate to rachises, basiscopically decurrent; veins mostly paired at base, forked above base, or rarely simple. Fertile lamina pinnate, (8-)16-26(-45) × (2-)4-10(-16) cm; rachises abaxially flattened or grooved; pinnae (9-)13-17(-24) pairs, sessile or shortly stalked; proximal pinnae shortly stalked, not abbreviated. Paraphyses many or few, rarely shed early, yellow or brown. Spores yellow, with reddish tubercles. 2n = 260.
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