Plants 15-30 cm tall. Rhizome erect, short, apex scaly; scales narrowly triangular, 3.5(-5) × ca. 0.5 mm, with brown central stripe and paler clathrate borders, entire. Fronds caespitose; stipe shiny brown to black, 3-5 cm, stout, base terete, densely scaly, upward subglabrous and becoming trigonous and then triangular, abaxially carinate to winged and adaxially flat to sulcate with a brown membranous wing along each lateral side, stipe and rachis usually persistent after shedding of pinnae; lamina linear, 12-28 × 1-2.5 cm, attenuate to both ends, 1-pinnate; pinnae 20-35 pairs, (sub)opposite to alternate, usually at right angles to rachis, sessile, middle pinnae oblong to rectangular, 5-13 × 2-7 cm, base asymmetrical, acroscopic side truncate, sometimes auriculate, parallel with or covering rachis, basiscopic side narrowly cuneate, margin crenate, apex obtuse; basal pairs of pinnae gradually reduced, flabelliform. Veins pinnate, costa obscure, veins 1-forked. Fronds papery, green or brownish green when dry; rachis stout, shiny dark brown to black, subglabrous, triangular, abaxially winged, adaxially sulcate with 2 entire, lateral, brown membranous wings, often gemmiferous near apex, with 1 or 2(or 3) scaly axillary buds. Sori 3-6(-11) per pinna, linear, 1-2 mm; indusium grayish green, semi-elliptic, membranous, entire, opening toward costa.
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