10. Hymenophyllum polyanthos (Swartz) Swartz, J. Bot. (Schrader). 1800(2): 102. 1801.
长柄蕗蕨 chang bing lu jue
Trichomanes polyanthos Swartz, Prodr. 137. 1788; Hymenophyllum constrictum Hayata; H. hayatae Masamune; H. microsorum Bosch; H. osmundoides Bosch; H. paniculiflorum C. Presl; H. parallelocarpum Hayata; H. paramnioides (H. G. Zhou & W. M. Chu) X. C. Zhang; Mecodium acrocarpum Ching; M. hainanense Ching; M. jinfoshanense Ching & Z. Y. Liu; M. kansuense Ching & Y. P. Hsu; M. likiangense Ching & P. S. Chiu; M. lofoushanense Ching & P. S. Chiu; M. lushanense Ching & P. S. Chiu; M. microsorum (Bosch) Ching; M. osmundoides (Bosch) Ching; M. ovalifolium Ching & P. S. Chiu; M. paniculiflorum (C. Presl) Copeland; M. paramnioides H. G. Zhou & W. M. Chu; M. polyanthos (Swartz) Copeland; M. szechuanense Ching & P. S. Chiu; M. wangii Ching & P. S. Chiu; M. wenhsienense Ching & Y. P. Hsu.
Plants 5-15 cm tall. Rhizome brown or black, 0.2-0.3 mm in diam., with sparse brownish hairs, hairs caducous, with sparse rootlets. Stipes remote, 0.5-4 cm apart, columnar, 0.4-8 cm, slender, rarely decurrent to base, wingless or narrowly winged at apex, wings flat. Lamina 1- or 2-pinnate to quadripinnatifid, brown-green or brown when dry, triangular-ovate or obovate to linear, 1-13 × 0.3-5 cm, membranous, glabrous, base cuneate, cordate, or rounded, apex acuminate or obtuse; pinnae 4-15 pairs, alternate, spreading, oblong to ovate or narrowly ovate, base cuneate to cordate, apex obtuse to acuminate; ultimate segments linear or oblong, 1-4 × 0.8-1.5 mm, with 1(or 2) veinlets, margin entire, apex rounded or somewhat retuse. Veins dichotomous, obvious. Sori usually on upper parts of frond, terminal on ultimate segments; involucres bivalvate, entire or toothed at apex, obtuse or acute at apex. 2n = 56.
On rocks or tree trunks near streams in forests; 800-1900(-3400) m. Anhui, Fujian, Gansu, Guangdong, Guangxi, Guizhou, Hunan, Jiangxi, Sichuan, Taiwan, Zhejiang [tropical and subtropical regions worldwide].
Hymenophyllum punctisorum Rosenstock (Hedwigia 56: 333. 1915), described from Taiwan, is included here by some authors (e.g., Knapp, Ferns Fern Allies Taiwan, 991. 2011).
