CYCADALES 



125 



The size, color, and surface of the ovules differ in the various 

 genera and even in the species of a genus. The largest ovules are 



Fig. ii6. — Dioon eduie: longitudinal section of strobilus, showing crowding of 

 ovules and consequent development of false stalks; this strobilus is 33 cm. in length. — 

 After Chamberlain (46). 



formed in Cycas circinalis, in which they become 6 cm. long and 4 cm. 

 wide. The ovules of Dioon spimdosum are almost as large, and from 

 these dimensions all sizes are found down to the tiny ovules of species 



