640 INDEX 



Woodwardia orientalis, 351, 352 

 X 



X-chromosome, 359, 360 

 Xeno-parasitism, 343 

 Xylem, 65 



Yeast, 95, 98, 306 



Yeast what is, 98 

 Yucca. 62 



Zamia, 333, 393, 411, 610 



floridana, 404, 407 

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

 Zygospores, 345 

 Zygote, 1 80 



