Rhizome shortly creeping, often stiff, densely scaly; scales brown or dark brown, linear-lanceolate or subulate, 8-15 × 0.5-1.5 mm, base slightly dentate or ciliate, apex attenuate, margin entire, firmly membranous. Fronds approximate, 0.5-1.1 m; stipe (ochraceous or) stramineous, 27-60 cm, 3-4 mm in diam., base with scales similar to those on rhizome, upward sparser and often entire-margined, or ± glabrescent; lamina 3- or 4-pinnate, brownish when dried, ovate-oblong or ovate-deltoid (or ovate-pentagonal), 25-50 × 18-35 cm, papery or subleathery, base rounded or shallowly cordate, apex acuminate or narrowly deltoid, rachis scaly or glabrescent as distal portion of stipe; pinnae ca. 10 pairs, alternate or lower 1(-3) pairs opposite, with to 2 cm stalk, obliquely spreading; lowest pinnae deltoid or obliquely quadrangular, to 25 × 15 cm, base broadly cuneate, apex acuminate; primary pinnules ca. 16 pairs, deltoid-lanceolate or oblong, proximal basiscopic 1(or 2) slightly longer (to 13 × 4.5 cm), base broadly cuneate, apex acuminate; secondary (and tertiary) pinnules shortly stalked or sessile, oblong or rhombic, ca. 1.5 × 0.7 cm, base acroscopically truncate, slightly auriculate, basiscopically cuneate, apex acute or obtuse, margin sharply serrate or pinnatifid, often aristate; upper pinnae often oblong-lanceolate; axes of lamina, pinnae, and pinnules with sparse minute (ovate- or) lanceolate apical threadlike scales abaxially. Sori terminal (or subdorsal) on veinlets, 1-5 pairs per ultimate segment, medial between midvein and margin; indusia brown, membranous, entire, and fugacious. 2n = 82*.
Rhizome short, erect or ascending; scales dense, linear, up to 2 cm or more long, 1.5 mm broad at base, brown, entire, more or less crisped in linear apical portion. Stipe stramineous, densely scaly at base, more sparsely upwards, up to 1 m long; scales on upper part smaller and narrower, dark. Lamina oblong-subdeltoid, more than 80 by 50 cm, tripinnate; rachis scaly, grooved; pinnae gradually reducing in size upwards, the lowest the largest, middle pinnae falcate, oblong-subtriangular, gradually narrowing towards acuminate apex, distinctly stalked, up to 30 by 12 cm at base; pinna-rachis densely fibrillose scaly; pinnules oblong-subdeltoid, caudate-acuminate at apex, unequally cuneate at distinctly stalked base, 5–7 by 1.5–2 cm; segments oblong-lanceolate to subquadrangular, oblique or slightly falcate, acute to acuminate, crenate at margin, about 1.2 by 0.4 cm; chartaceous, deep green, fibrillose scaly, glabrous on lamina surfaces. Sori terminal on veinlets, closer to midrib than to margin of segments, round; indusia round-reniform, glabrous.
On rather dry mountain slopes in mixed or in evergreen forests at medium altitudes.
Thailand, Himalaya (type) to SW. China and Vietnam.