INDEX 



385 



Xanthophyll, 70 

 Xerophyte, 165, 166, 170 



leaf blade of, 165 



stoma of, 165 

 Xylem, 47, 100 



Y 



Yeast, fermentation by, 131 

 Yeasts, 295 



Zein, 121 

 Zoospore, 267 

 Zygospore, 26S 



formation of, in Mucor, 290 

 Zygote, 184, 246 

 Zymase, 131 



