Description from Flora of China
Davallia platyphylla D. Don, Prodr. Fl. Nepal. 10. 1825; Microlepia grandissima Hayata.
Plants terrestrial. Rhizome creeping, 15-20 mm in diam., stiff and woody, with dense, dark red-brown, subulate bristles. Fronds approximate, ca. 2 m tall; stipe light brown to straw-colored, shiny, 70-100 cm, ca. 1 cm in diam. at base, woody, hairy only at base; rachis similar, glabrous; lamina yellow-green when dried, 2-pinnate, broadly triangular in outline, 100-140 cm, almost as wide as long, nearly leathery, both surfaces glabrous except for dense, short, light brown hairs on rachillae; pinnae ca. 8 pairs, alternate, 15-20 cm apart, spreading obliquely upward, stalk 20-40 mm, basal pair largest, 1-pinnate, triangular in outline, 45-60 cm, apex acuminate; pinnules 6 or 7 pairs, alternate, anadromous, ca. 5 cm apart, spreading obliquely upward, lanceolate, subfalcate, 10-15 × 2.5-3.5 cm at base, base unequally cuneate, acroscopically obliquely truncate above, with rounded auriculate prominence, margin rounded lobed to pinnatifid, becoming rounded lobed and serrulate, narrowly cartilaginous, apex long acuminate and with rounded notch; pinnules progressively shorter distally, connate at base, decurrent, merging into pinnatifid and acuminate terminal segment. Veins abaxially coarse and distinct, adaxially obscure, pinnate in lobules, 4 or 5 pairs, not furcate, very oblique, not reaching margin. Sori 2-5 per lobule, orbicular and large; indusium brown, orbicular-reniform, large, membranous, entire, basifixed, glabrous, persistent.
Forests; 1000-2100 m. Guangxi, Guizhou, Hainan, SC Taiwan (Jiayi), Xizang, Yunnan [Bhutan, India, Laos, Myanmar, Nepal, Philippines, Sri Lanka, Thailand, Vietnam].