Stipe 100 cm or more long; basal scales 2.5 cm long, pallid and 5 mm wide at their bases, abruptly narrowed to 1.5 mm 5 mm above the base, thin, filiform and dentate distally; lamina 120 cm long; rachises dark castaneous and minutely hairy on abaxial surface; basal pinnae 85 cm long with three diminishing pinnate basiscopic pinnules, the largest 45 cm long with many deeply lobed tertiary leaflets to 10 × 2.3 cm, largest acroscopic pinnules 17 cm long; pinnules on first suprabasal pinnae to 16 × 4.5 cm, narrowly acuminate, lobed to less than 2 mm from the costa, firm and opaque when dried, costules to 8 mm apart, lobes crenate to lobulate, narrowed to an acute hardly falcate apex; sinus teeth short and broadly triangular, oblique, on basiscopic side of sinuses, sometimes present also between lobules of pinna-lobes; veins forming very narrow costal areoles, also an almost complete set of costular ones, free veins passing from the latter to the margin, paucipinnate in lobules; sori exindusiate, in one row on each side of costules of lobes, nearer to costules than to margin, on outer veins of areoles; spores minutely spinulose; elongate unicellular glands present on stalks of sporangia.
Home