屋久假瘤蕨 wu jiu jia liu jue

Polypodium engleri Luerssen var. yakushimense Makino, Bot. Mag. (Tokyo) 23: 248. 1909; Crypsinus yakushimensis (Makino) Tagawa; Phymatodes yakushimensis (Makino) Tagawa; Phymatopsis fukienensis Ching; P. yakushimensis (Makino) H. Itô; Phymatopteris fukienensis (Ching) Pichi Sermolli; P. yakushimensis (Makino) Pichi Sermolli; Polypodium yakushimense (Makino) Makino & Nemoto.

Rhizome ca. 3 mm in diam., densely scaly; scales brown, lanceolate, margin entire, apex acuminate. Fronds monomorphic. Stipe straw-colored, 5-15 cm, slender, glabrous; lamina simple, linear-elliptic, 5-15 × 1-2 cm, base cuneate, margin notched, apex acuminate. Lateral veins distinct, veinlets obscure. Lamina papery, both surfaces glabrous, abaxial surface glaucous, adaxial surface green. Sori orbicular, medial, sunken on abaxial surface and raised on adaxial surface.

On muddy rocks along streams, usually rheophytic in flood zone, forests; 100-1800 m. Fujian, Guangxi, Guizhou, Hunan, Jiangxi, Taiwan, Zhejiang [Japan, Korea].