CYCADALES 



151 



178 





181 





... .,.- -I-.'.. '.;p^ 



I 











Figs. I'ji-iSi.—Zamiafloridana: fig. 1 78, free nuclei of proembryo; X16; fig. 179, 

 tissue at base of proembryo; X24; fig. 180, differentiation into suspensor and embryo; 

 X2q; fig. 181, young embryo showing long suspensor, natural size. — After Coulter 

 and Chamberlain {t,^). 



