Rachis of scandent fronds glabrous, up to 2 mm diameter; primary rachis-branches very short, dormant apex covered with pale hairs having swollen bases; secondary rachis-branches rarely unbranched, normally once dichotomous (10-20 mm long below the dichotomy), each branch with a simple leaflet or rarely one leaflet double, rarely the secondary branch-system sub-pinnate with two lateral and one terminal leaflets; sterile leaflets 20-35 cm long (on upper parts of frond smaller), 3.5-5 cm wide, margin more or less distinctly serrulate and slightly thickened, base cuneate (rarely cordate on the outer base), surfaces quite glabrous except the upper surface of the costa towards its base, lamina not verrucose when dry; fertile leaflets similar to sterile but slightly smaller, 10-30 cm long, 12-40 mm wide (smallest on upper branches), sorophores 4-10 mm long, usually about 2 mm apart, at the apices of small triangular projections of the lamina; spores quite smooth.
In light places in freshwater swamp-forest; in Sarawak twice reported in the neighbourhood of limestone hills but certainly occurring also not in the vicinity of limestone; one specimen from Sarawak, found growing with Imperata on sandy ground, has unusually small leaflets.
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