Rhizome short to c. 15 cm long, suberect, narrow or thick with many stipe bases. Stipes stramineous, of sterile fronds (6-)12-20(-30) cm long, of fertile fronds 20-45 cm long, base slightly or moderately enlarged, 4-6(-8) mm wide in the middle, in cross section one V-shaped vascular bundle, upper part of stipe (sharply) 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 carinate, not winged (or winged on the sharp ridge), rachis 1-2 mm wide in the middle part. Sterile lamina herbaceous, not glaucous, pinnatifid, widest medially, (10-)20-40(-55) by (3-)5-13(-17) cm, index (2.5-)3-4(-5.4); pinnae (12-)35-53 pairs, widest near base, veins of pinnae paired at base, forked above base to paired at base, or branched at base, both branches forked above or rarely simple, distinct on both surfaces, stomata scattered on lower epidermis, margin serrulate, sometimes towards base becoming entire or nearly so, or entire except apex (rarely biserrulate to the apex), most pinnae except the uppermost with (nearly) inequilateral base, adnate to rachis; lowermost pinnae adnate, deflexed (usually), not shortened to abruptly shortened; middle pinnae (1.5-)5-8.5 cm long, 0.4-1 cm wide in the middle, acroscopic side of base adnate to the rachis but not into a wide wing, basiscopic side perpendicular to rachis or rounded, partly free from rachis or round; uppermost pinnae adnate, base about equal-sided, basiscopically perpendicular to the rachis; apex of lamina pinnatifid, terminated by a pinnatilobed, long-triangular segment. Fertile fronds usually longer than the sterile ones, dorsal side of rachis carinate, rachis 1.5-2.5 mm wide in the middle part; lamina deeply pinnatifid, rachis slightly winged throughout, 20-50 by 3-6 (-10) cm; pinnae glabrous,(15-)35-50 pairs, margin subentire; lowermost pinnae not or gradually shortened (sometimes not well developed), 2-3 cm apart; middle pinnae (1-)2.5-5 cm long, 2-4 mm wide, base broadly adnate; apex pinnatifid, acuminate, or caudate. Paraphyses few, mostly lost or absent, yellow. Spores yellow, with reddish tubercles.
More
Stipes (6-)12-20(-30) cm on sterile fronds, 20-45 cm on fertile fronds, distally sharply triangular in cross section; vascular bundle V-shaped; stipes and rachises glabrous; aerophores cushionlike, present only on stipe base. Sterile lamina pinnatifid, (10-)20-40(-55) × (3-)5-13(-17) cm, not glaucous, apex confluent, terminating in a pinnatilobed segment; rachises abaxially carinate; pinnae (12-)35-55 pairs; proximal pinnae adnate to rachises, usually deflexed, not abbreviated or abruptly abbreviated; middle pinnae adnate to rachises, basiscopically straight or rounded; distal pinnae subequilaterally adnate to rachises, basiscopically straight or rounded; veins paired at base and forked above, paired or branched at base with both branches forked above, or rarely mostly simple. Fertile lamina deeply pinnatifid, 20-50 × 3-6(-10) cm; rachises abaxially carinate, sometimes winged; pinnae (15-)35-50 pairs, sessile, broadly adnate to rachises; proximal pinnae not abbreviated or gradually abbreviated, sometimes not well developed. Paraphyses few, often shed early or absent, yellow. Spores yellow, with reddish tubercles.
Home
