Plants ca. 2 m tall. Rhizome creeping. Fronds papery when dried; stipe brownish black, apically reddish brown to brown-straw-colored, slightly shiny, up to 1 m, ca. 5 mm in diam. at base, adaxially grooved; lamina pale green, 3-pinnate-pinnatifid, narrowly triangular-ovate in outline, ca. 100 × 50 cm, abaxially with light gray-brown hairs along costae, adaxially glabrous, base rounded-cuneate, apex acuminate; pinnae ca. 6 pairs, opposite or subopposite; basal pinnae ovate-triangular, base rounded-cuneate, stalked (ca. 6 cm), 2-pinnate-pinnatifid (1-pinnate apically), apex acuminate; pinnules ca. 10 pairs per pinna, alternate, slightly obliquely spreading; basal pair ca. 22 × 7-8 cm, pinnate, narrowly triangular, base truncate, stalked (ca. 1 cm), apex long caudate (2.5-3 cm); ultimate pinnules to 18 pairs per pinnule, alternate, spreading, falcate-lanceolate, up to 30 × 3-4 mm, apex acute; lower ones nearly separate from costules or slightly connected to costules, basal ones generally triangular auriculate, entire, costules not winged, only ultimate segments slightly expanded on both sides; veins approximate, anadromous, conspicuous on both surfaces; rachises and costae glabrous, costules glabrescent, adaxially deeply grooved, glabrous, straw-colored.
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