蛇足石杉

株：多年生土生蕨类。

茎：茎直立或斜生，高10-30厘米，中部径1.5-3.5毫米，枝连叶宽1.5-4厘米,二至四回2叉分枝，枝上部常有芽-。

叶：叶螺旋状排列，疏生，平伸，窄椭圆形，向基部明显变窄，通直，长1-3厘米，宽1-8毫米，基部楔形，下延有柄，先端尖或渐尖，边缘平直，有粗大或略小而不整齐尖齿，两面光滑，有光泽，中脉突出，薄革质。

果：孢子叶与不育叶同形；孢子囊生于孢子叶的叶腋，两端露出，肾形，黄色。

多年生土生蕨类。茎直立或斜生，高10-30厘米，中部径1.5-3.5毫米，枝连叶宽1.5-4厘米,二至四回2叉分枝，枝上部常有芽-。叶螺旋状排列，疏生，平伸，窄椭圆形，向基部明显变窄，通直，长1-3厘米，宽1-8毫米，基部楔形，下延有柄，先端尖或渐尖，边缘平直，有粗大或略小而不整齐尖齿，两面光滑，有光泽，中脉突出，薄革质。孢子叶与不育叶同形；孢子囊生于孢子叶的叶腋，两端露出，肾形，黄色。

分布：日本、朝鲜半岛、泰国、印度支那、印度、尼泊尔、缅甸、斯里兰卡、菲律宾、马来西亚、印度尼西亚、太平洋地区、俄罗斯、大洋洲及中美洲

产地：黑龙江、吉林、辽宁、陕西、江苏、安徽、浙江、台湾、福建、江西、湖北、湖南、广东、香港、广西、贵州、四川、云南及西藏

生境：林下、灌丛中或路旁

海拔：300-2700米

Huperzia serrata (Thunb. ex Murray) Trev. in Atti Soc. Ital. Sci. Nat. 17: 247. 1874; Rothm. in Fedde, Repert. Sp. Nov. 54: 58. 1944; Sen et Sen in Fern Gaz, 11 (6): 417. 1978: Ching in Acta Bot. Yunnan. 3 (3): 294. 1981; C. Y. Yang in ActaPhytotax. Sinica 20 (4): 447. 1982; Ching et S. K. Wu in C. Y. Wu, Fl. Xizang. 1: 11. 1983: P. S. Wang et X. Y. Wang in Guizhou Sci, 2: 49. 1983; Fl. Anhui, 1: 18, f. 1, 1985; H. S. Kung, Fl. Sichuan. 6: 30, Pl. 3: 1-7. 1988; Fl. Liaoning. 1: 10, Pl. 1: 6-7. 1988: Bir et al. in Ind. Fern J. 6: 33. 1989: B. Ollg. in Opera Bot. 92: 164. 1987, et Index Lycop. 20. 1989; J. Z. Wang in Journ. Hebei Forest. coil. 5 (2): 115. 1990; S. F. Wu in Shanghai Teach. Loll. Tech. 10 (4): 89. 1990; Nakaike, N. Fl. Jap. Pterid. rev. enlarg. 792. 1992; P. S. Wang, Pterid. Fanjing Mt. 18. 1992: Fl. Jiangxi 1: 24, f. 8. 1993; Fl. Zhejiang 1: 2, f. 1-1. 1993; X. Y. Wang inBull. Bot. Res. 14 (4): 356. 1994; Keys Vasc. Pl. Wuling Mts. 4. 1995; L. B. Zhanget H. S. Kung in Acta Phytotax. Sin. 38 (1): 14. 2000. ——Lycopodium serratumThunb. ex Murray, Sys. Veg. ed. 14. 1784 (May-Jul. ) ; B. Ollg. l. c. 70. ——L. ser-ratum Thunb. Fl. Jap. 341, t. 38. 1784 (Aug. ) ; C. B. Clarke in Trans. Linn. Soc. II. Bot. 1: 591. 1880: Baker, Handb. Fern Allies 30. 1887; Christ in Bull. Acad. Geogr. Bot. 11: 271. 1902; Hayata, Ic. Pl. Formos. 4: 133. 1914; Alderw, Malay. Fern-allies30. 1915; Iljin in Kom. , Fl. URSS. 1: 114. 1934; Alston in Fl. Indo-Chine 7 (2): 548. 1951; S. H. Fu, Ill. Imporant Chinese Pl., Pterid. 2. f. 1. 1957; Herb. Pl. Northeast China 1: 2, f. 1. 1958: Tagawa, Col. Ill. Jap. Pterid. 9. Pl. 1-5-a. 1959; Fl. Hainan. 1: 8. 1964: Mehra et Bir in Res. Bull. Panjab Univ. 15 (1-2): 101. 1964; Tagawa in Hara, Fl. E. Himal. 2: 199. 1971; Ic. Corm. Sin. 1: 107. f. 214. 1972; Fl. Tsinling. 2: 15. 1974; Y. L. Chang et al, Sporae Pterid. Sin. 39. Pl. 1: 26-29. 1976: Fl. Jiangsu 1: 11, f. 2. 1977; Tagawa et K. Iwats. in Fl. Thailand3 (1): 7. 1979; Fl. Henan 1: 2, f. 1. 1981: Fl. Fukien 1: 8, f. 5. 1982; Nakaike, N. Fl. Jap. Pterid. 30. f. 30. 1982; C. M. Kuo in Taiwania 30: 11. 1985; Fl. Fuj ian. rev. 1: 8, f. 5. 1991; K. Iwats. , Ferns Fern Allies Jap. 43. 1992; J. L. Tsai et W. C.Shieh in T. C. Huang, Fl. Taiwan ed. 2, 1: 42. 1994.——Urostachys serratus (Thunb. ex Murray) Herter ex Nessel, Baerlappg. 56. 1939. ——L. javanicum Sw. Syn. Fil. 175, 399. 1850. ——L. serratum Thunb. ex Murray var. thunbergii Makino in Bot. Mag. Tokyo 12: 12. 1898. ——L. serratum Thunb. ex Murray var. jazxanicum (Sw.) Makino in Bot. Mag. Tokyo 12: 13. 1898. p. p. : Takeo，Ill. Formos. Pl. Suppl. 7. f.7. 1928. ——L. serratum Thunb. ex Murray var. longipetiolatum Spring，Monogr. Ly-cop. 2: 18. f. 1: 9-11. 1850; Tagawa，l. c. 10. pl. 1-5-b. f. 2: 5; De Vol in H.L. Li，Fl. Taiwan 1: 29. 1975; K. Iwats. ，l. c. 43. ——H. serrata (Thunb. ex Murray) Trev. f. longipetiolata (Spring) Ching in Acta Bot. Yunnan. 3 (3): 294. 1981;Fl. Dulongjiang Reg. 1. 1993; Fl. Jiangxi 1: 25. 1993. ——L. serratum Thunb. exMurray var. myriophyllifolium Hayata，Ic. Pl. Forms. 4: 133. 1914: De Vol，1. c. 30; J. L. Tsai et W. C. Shieh，1. c. 42. ——Urostachs myriphyllifolius (Hayata) Hert-er, Index Lycop. 71. 1949 (“myriophyllus”). ——H. myriophyllifolia (Hayata) Holubin Folia Geobot. Phytotax. 20: 75. 1985. ——L. serratum Thunb. ex Murray var. inter-medium Nakai in Bot. Mag. Tokyo 39: 285. 1925; Tagawa，l. c. f. 3-4; K. lwats. ，l. c. 43. 1992. ——H. serrata (Thunb. ex Murray) Trev. f. intermedia (Nakai) Ching，l. c. 294. ——H. serrata (Thunb. ex Murray) Trev. f. intermedia (Nakai) Ching et S.K. WuinC. Y. Wu，Fl. Xizang. 1: 11. 1983. ——H. serrata (Thunb. ex Murray) Rothm. ，l. c. 59. ——H. selago (L.) Bernh. ex Schrank et Mart. var. serrata (Thunb.ex Murray) Love et Love in Univ. Color. Stud. 17: 5. 1965.