no 



THE LIVING CYCADS 



The blepharoplast, shortly before the division of the 

 body cell, has reached its maximum size. During its 

 growth it becomes increasingly vacuolate, until it is a 

 mere shell with such large vacuoles that the interior looks 



^ * 



i^m 



s 



i 



}9 r* 



Fig. 59. — Ceratozamia mexicana: photomicrograph of a section of a 

 sperm, showing the very large nucleus, with a thin sheath of protoplasm 

 and numerous cilia. Highly magnified. 



frothy. Even before the division is completed the 

 blepharoplast begins to break up into innumerable 

 small granules which become more or less flattened and 

 adhere to each other and then are drawn out into a 



