GINKGOALES 



213 



This embryogeny is remarkable for the extensive develoj)ment and 

 massive growth of the ])roembryonic tissue, l)ut in kind it resembles 



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

 fig. 248 shows the upper part of the endosperm and the outline of the embryo; X 10; 

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

 root and stem; X40; fig. 250, embryo at alxmt the stage .shown in fig. 233; X15; 

 fig. 251, nearly mature embryo; Xio. 



