Plants (4-)8-20(-35) cm tall. Rhizome erect, short, apex scaly; scales dark brown to black, narrowly triangular, (1.5-)3-4.2(-5) × 0.5-1 mm, fimbriate at base or subentire. Fronds caespitose; stipe semiterete, (0.5-)2-7(-12) cm, adaxially green and sulcate, abaxially shiny castaneous, brown color occasionally extending to rachis, with small dark brown, very narrow scales and uniseriate hairs, subglabrous when old; lamina triangular-ovate, (3-)6-13(-25) × (1-)2-4(-8) cm, base slightly reduced, bipinnate, apex acute-acuminate; pinnae (5-)8-12(-18) pairs, lower pinnae (sub)opposite, upper alternate, stalk ca. 1 mm, largest pinnae triangular-ovate, 8-17(-30) × (3-)6-10(-15) mm, base asymmetrical, acroscopically semicordate-truncate, basiscopic side cuneate, 1-pinnate, apex obtuse; pinnules 2 or 3 pairs, alternate, anadromous, basal acroscopic pinnule largest, fan-shaped to orbicular-obovate, 3.5-5.5 × 2.5-4(-6) mm, base cuneate, sessile to almost free, lateral side entire, apex serrate and obtuse; other segments smaller, usually adnate to costa. Veins not obvious, slightly raised adaxially when dry, anadromously forking, not reaching margin. Frond herbaceous, green or grayish green when dry; lamina with 3- or 4-celled uniseriate gland-tipped hairs, average guard cell length 46-52 µm; rachis semiterete, grayish green and sulcate adaxially, occasionally brown at base abaxially, subglabrous. Sori 2-4 per pinnule, submedian to median on subtending vein, often confluent at maturity, oval to linear, (1-)1.5-3(-4.5) mm; indusia gray, linear, membranous, repand to entire, opening toward costule or costa, persistent. Spores with cristate-alate perispore, average exospore length 31-35 µm. Plants sexual allotetraploid: 2n = 144.
Rhizome erect, c. 3 mm in diameter, set with dark brown, nitid, lanceolate-attenuate, subentire to somewhat fimbriate rhizome-scales c. 3 mm long. Fronds tufted, firmly membranous to herbaceous, not gemmiferous; stipe greenish becoming dark brown basally, set with scattered sinuous, hair-like scales; lamina narrowly elliptic, up to 170 x 80 mm, basal pinnae somewhat reduced, 2-pinnate; pinnae in up to 12 pairs, acroscopic basal pinnule enlarged; pinnules and pinnule lobes obovate, c. 6 mm long, outer margin sharply dentate, upper surface glabrous, lower surface set with minute scales. Sori 2 to 5 per lobe, c. 3 mm long; indusium membranous, almost transparent, erose, c. 0.6 mm broad.