392 



PLANT STUDIES 



Selaginella, 340. 



Sensitive plants, 11, 50. 



Sepal, 79. 



Seta, 303. 



Sexual spore, 230. 



Shoot, 53. 



Slime moulds, 290. 



Smilax, 61. 



Soil, 90, 145, 173. 



Sperm, 231. 



Spermatophytes, 222, 343, 344. 



Sphagnum, 318. 



Spiral, 365. 



Spirogyra, 244. 



Sporangium, 230, 325. 



Spore, 110, 229. 



Sporogonium, 303, 306. 



Sporophore, 266. 



Sporophyll, 346. 



Sporophyte, 303, 325. 



Stamen, 79, 346, 359. 



Stem, 54, 83, 139. 



Stigma, 125, 362. 



Stipules, 35. 



Stomata, 38. 



Strobilus, 338. 



Struggle for existence, 142. 



Style, 125, 362. 



Symbionts, 158, 295. 



Symbiosis, 158, 295. 



Temperature, 145, 171. 

 Thallophytes, 222, 224, 299, 344. 

 Transpiration, 31, 154. 

 Tuber, 74. 

 Tumbleweed, 117. 



Ulothrix, 237. 



Vascular system, 83. 



Vaucheria, 242. 



Vegetative multiplication, 109, 



229. 

 Veins, 36, 40. 

 Violet, 117. 



Water, 142, 151, 170; reservoirs, 



201. 

 Water ferns, 336. 

 Wheat rust, 279. 

 Wind, 174. 

 Witch hazel, 118. 

 Woodbine, 63. 



Xerophytes, 175, 188. 



Yeast, 278. 

 Yucca, 131. 



Zoospore, 230. 

 Zygotes, 237. 



THE END 



t^m^^ (13) 



