INDEX 



319 



Water-net (see also "Hydrodic- 



tyon), 43, 44, Fig. 7. 

 Weeds, 240, 241, 243. 

 Western America, 233, 238, 239. 

 Western Asia, 233. 

 Western Europe, 233. 

 West Indies, 194. 

 Wheat-rust (Pucciniagraminis),SS, 



89, 95. 



White birch, 230. 

 White rust (Cystopus candidus),%2, 



83, 84, 85, Fig. 21. 

 Wild-oats (Avenafatua), 241. 

 Willow, 206, 228, 229, 230, 244, Fig. 



49. 

 Wind-pollination (see also " Anem- 



ophily"),244. 

 Winter buds (of deciduous trees), 



270, 281, Fig. 59. 

 Wood, woody tissue, 124, 267. 



Xylem (see also " Wood "), 124. 

 Xerophytes, 201, 204, 271, 272, 273, 

 274. 



Yeast-fungus (Saccharomyces), 96. 

 Yew (see also "Taxus"), 165, 168. 

 Yucca, 191, 237, 257, 272. 



Zamia, Z. integrifolia, 162, 163, Fig. 



40. 



Zauschneria, 249. 



Zingiber (see also " Ginger "), 193. 

 Zoology, 11. 

 Zoospores(see also " Swarm-spores "), 



44, 50, 51, 52, 53, 54, 57, 58, 69, 70, 



73, 78, 82, 83, 84, 86, 102, 104, 118, 



128, 266, 285, 286, 287. 

 Zygomorphy, Zygomorphic flowers, 



189, 191, 193, 194, 195, 207, 209, 210, 



251, Figs. 46, 47, 50, 51, 56, 57. 

 Zygospores (of Conjugatse), 61, 86. 

 Zygote (see also "Zygospores), 26, 



39. 



