544 



INDEX 



Versatile, 158. 

 Vessels, 58, 60, 64. 

 Vetch, 128, 129. 

 Viburnum, 448. 

 Viburnum opulus, 188. 

 Violet, seed of, 202, 415. 

 Virgin's bower, 94. 

 Viscurn album, 136. 

 Vitis-Idaea vitisidaea, 446. 

 Volva, 325. 



Walking fern, 357. 



Walnut, 208. 



Walnut order, 433. 



Wandering jew, 33, 34. 



Water molds, 280282. 



Water net, 241, 251. 



Water storage in plants, 479. 



Water vapor, 99. 



Water melon, 449. 



Wheat, 423-425. 



Wheat grains, germinating, 35, 117, 



118. 



Wheat rust, 309-317, 319, 320. 

 Wheat seedlings, respiration of, 118. 

 Wheat smut, 306-308. 

 Wheat, structure of grain, 19, 20. 

 Wheel-shaped, 146. 

 White pine, 390-396. 

 White rust, 282, 283, 285. 

 Willow mildew, 289. 

 Willow order, 433. 



Willow, shoots of, 75. 

 Wind, 452, 453. 

 Wind-pollinated, 183, 186. 

 Wintergreen, 445. 

 Wintergreen leaf, section of, 90. 

 Witches' broom, 309. 

 Wood, porosity of, 56, 66. 

 Wound parasite, 139. 



Xanthoxylum, 441. 

 Xerophytes, 456, 457, 460. 

 Xerophytic, 457, 460. 

 Xylem, 36, 63, 64. 

 Xylogen, 140. 



Yeast, 122. 

 Yeast fungi, 295-298. 

 Yew, fruit of, 214. 

 Yucca, flower and pollination of, 185. 

 186. 



Zamia, 387, 399-401, 431. 



Zamia, fruit of, 399. 



Zamia, sporangia of, 398, 399. 



Zea mays, 172, 427. 



Zonal distribution, 483. 



Zoogonidia, 242, 243. 



Zoospores, 241-246, 258, 284-286. 



Zygnema, 239. 



Zygospore, 236-243, 277-280. 



Zygote, 237, 238, 355, 372, 406. 



