CYCADALES 



151 







Figs. 178-181. — Zamiafloridana: fig. 1 78, free nuclei of proembryo; X16; fig. 179, 

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

 X29; fig. 181, young embryo showing long suspensor, natural size.— After Coulter 

 and Chamberlain (33). 



