640 



INDEX 



Xeno-parasitism, 343 ^ 



Xylem, 65 



Zamia, 333, 393, 411. 610 

 floridana, 404, 407 

 Yeast, 95, 98, 306 Zea Mays, 62, 85, 123, 299, S62, 563 



what is, 98 Zygospores, 345 



Yucca, 62 Zygote, 180 



