Youngest stage: fronds up to 3 cm long dimidiate with 3 free pinnae all on lower side of rachis (rarely 1 leaflet or lobe on upper side); fronds 3 cm long and larger dimidiate with jointed apical pinna, pinnae 4, to 10 by 3-5 mm, base asymmetric, edges crenate to deeply lobed; later bathyphylls with pinnae both sides, on a frond 7.5 cm long apical pinna 20 by 8 mm, lateral pinnae 6 pairs, crenate, decreasing downwards, lowest 13 by 6 mm, base narrowly cuneate on basiscopic side, broadly on acroscopic. Intermediate fronds 14 cm long, pinnae 8-9 pairs, apical one 3.8 by 1.4 cm, edges almost entire. Adult rhizome 4-5 mm ø, aculeate. Sterile acrophylls: stipe 5.5 cm, lamina 45 cm, pinnae 11-12(-20?) pairs, to 15 by 2.8 cm, lowest stalked 5 mm, basiscopic base narrowly cuneate, acroscopic broadly rounded, upper pinnae with more symmetric bases. Fertile fronds: pinnae 20-24 cm long, 2.5-3 mm wide, stalks to 5 mm long.
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