Rhizome robust, 4-5 mm in diam., densely covered with scales, woody. Scales rufous, triangular, peltate, 4-5 × ca. 2 mm, overlapping, base truncate, margin glabrous, apex attenuate to obtuse. Stipe brown, 20-24 cm, ca. 2 mm thick, finely grooved adaxially, base densely covered with scales similar to those on rhizome, sparser apically; lamina tripinnate or basally 4-pinnate pinnatifid, broadly triangular-ovate, 25-28 × 18-22 cm, base nearly rounded, apex acuminate. Longest petiolules 3-20 mm; pinnae in 11-13 pairs, alternate or basal 1 or 2 pairs subopposite, basal pair of pinnae largest, narrowly triangular-lanceolate, 15-16 × 4.5-5.5 cm, base broadly cuneate, apex long acuminate, with basal stalk ca. 2 cm, bipinnate; pinnules in 10-12 pairs, alternate, anadromous, with a shortened petiolule 5-6 mm, basal pinnule largest, 1.8-2.1 × 0.7-0.9 cm, asymmetrically cuneate; ultimate pinnae in 6-8 pairs, alternate, shortly stalked or subsessile, basal pinna larger, ovate-triangular, 0.9-1.6 × 0.5-1 cm, base obliquely cuneate and decurrent, apex acute; lobes entire, apex obtuse or with sinus, 3-4 × ca. 1 mm; upper pinnae gradually shortened, lanceolate, 3-pinnate and shallowly pinnatifid, lobes entire, terminal pinnae shortened to ovate-triangular, close together. Veins inconspicuous, veinlets simple or forked; false veins absent. Sori separate, borne always single on middle of pinnae segment; indusium brown, broadly crateriform, ca. 0.4 × 0.6 mm, entire, membranous, basifixed, both sides free.
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