GINKGOALES 



213 



This embryogeny is remarlsable for the extensive development and 

 massive growth of the proembryonic tissue, but in kind it resembles 



Figs. 248-251. — Ginkgo biloba: later stages in the development of the embryo; 

 fig. 248 shows the upper part of the endosperm and the outline of the embryo; Xio; 

 fig. 249, drawn on a larger scale from the same embryo, shows the differentiation into 

 root and stem; X40; fig. 250, embryo at about the stage shown in fig. 233; XiS; 

 fig. 251, nearly mature embryo; Xio- 



