640 INDEX 



Woodwardia orientalis, 351, 352 

 X 



Yeast what is, 98 

 Yucca. 62 



A'-chromosome, 359, 360 

 Xeno-parasitism, 343 

 Xylem, 65 



Yeast, 95, 98, 306 



Zamia, 335, 393, 411, 610 



floridana, 404, 407 

 Zea Mays, 62, 85, 123, 299, 562, 563 

 Zygospores, 345 

 Zygote, 180 



