4. Hymenophyllum badium Hooker & Greville, Icon. Filic. 1: t. 76. 1828.
蕗蕨 lu jue
Hymenophyllum crispato-alatum Hayata; H. crispatum Hooker & Greville; H. flexile Makino; H. javanicum Sprengel var. badium (Hooker & Greville) C. B. Clarke; H. retusilobum Hayata; Mecodium badium (Hooker & Greville) Copeland; M. crispato-alatum (Hayata) Copeland; M. crispatum (Hooker & Greville) Copeland; M. flexile (Makino) Copeland; M. propinquum Ching & P. S. Chiu; M. tenuifrons Ching.
Plants 10-30 cm tall. Rhizome brown, ca. 0.8 mm in diam., subglabrous, with sparse rootlets. Stipes remote, ca. 2 cm apart, brown or green-brown, 5-10 cm × ca. 1 mm, glabrous, winged nearly to base, wings flat to crisped. Rachis and costae broadly winged throughout, glabrous, slightly zigzag. Lamina bipinnate to tripinnatifid, lanceolate, ovate-lanceolate, or ovate, 10-15 × 4-6 cm, membranous, glabrous; pinnae 10-12 pairs, closely spaced, alternate, spreading, triangular-ovate to ovate, 1.5-4 × 1-2.5 cm, base unequally cuneate, apex obtuse; pinnules 3 or 4 pairs, closely spaced, alternate, sessile, spreading, oblong, 1-1.5 cm × 5-8 mm, base decurrent, apex obtuse; ultimate segments simple or forked, oblong to linear, 2-5 × 1-1.5 mm, with a single veinlet, margin entire, apex obtuse. Veins dichotomous, obviously raised on each surface, brown, glabrous. Sori apical on short acroscopic segments; involucres subcircular or ovate, bivalvate, entire or slightly serrate, lobes slightly constricted below base of involucre.
On wet rocks near streams in forests, on moss-covered trunks of trees; 600-3000 m. Fujian, Guangdong, Guangxi, Guizhou, Hainan, Hubei, Jiangxi, Sichuan, Taiwan, Yunnan [Bhutan, India, Japan, Malesia, Nepal, Sri Lanka, Vietnam].
The authors have not seen material of Hymenophyllum crispato-alatum f. remotipinnum Hayata (Icon. Pl. Formosan. 5: 257. 1915).