裸叶瓦韦 luo ye wa wei

Pleopeltis nuda Hooker, Exot. Fl. 1: t. 63. 1823; Drynaria nuda (Hooker) Fée; Lepisorus gyirongensis Ching & S. K. Wu; L. leiopteris (Kunze) Bir & Trikha; Phymatodes nuda (Hooker) J. Smith; Pleopeltis leiopteris (Kunze) Sarn. Singh & Panigrahi; Polypodium leiopteris Kunze; P. nudiusculum Kunze; P. nudum (Hooker) Kunze.

Plants 15-23 cm tall. Rhizomes slender and creeping, 1.5-2 mm in diam., densely scaly; scales ± dark brown, ovate-lanceolate, 2-3 × 0.6-1.2 mm, basifixed, margin entire, apex shortly acuminate; middle lumina elongate, wall thickened, transparent. Fronds 0.5-1 cm apart; stipe deep brown, 1-5 cm, 0.8-1 mm in diam., smooth; lamina gray-green or brown on both surfaces when dried, lanceolate, 15-30 × 0.1-2 cm, widest at middle, softly leathery or leathery, very sparsely scaly, base cuneate and decurrent, margin flat and straight or slightly recurved, apex shortly acuminate. Main veins raised on both sides, veinlets obscure. Sori along distal 1/3 of lamina, slightly closer to costa, suborbicular, 2-2.5 mm in diam., slightly raised abaxially and sunken adaxially; paraphyses deep brown, orbicular, 0.4-0.55 mm in diam.; middle lumina subsquare and transparent.

On rocks in forests; 1500-2400 m. Xizang (Jilong), Yunnan [Bhutan, India, Kashmir, Myanmar, Nepal, Sri Lanka, Thailand].