PLATE III. 



PRO-EMBRYOS AND EMBRYONIC BRANCHES OF Char a fragilis, 



AFTER PRINGSHEIM. 



FIG. 



1. Fully developed normal pro-embryo, originating from 



oospore (o.). 



2. Two pro-embryos (P.) originating from stem-node. 



3. Two pro-embryos (P.) and one embryonic branch 



(E.B.) originating from stern-node. 



4. Two pro-embryos (from stem-node) in more advanced 



stage, the larger showing sexual plant (S.P.) in 

 early stages. 



5. Terminal bud of young sexual plant. a, apical-cell. 



6. First whorl of sexual plant (S.P.) arising from axil of 



pro-embryonic branchlets (P.jB.). 



7-9. Earlier stages in segmentation of pro-embryonic axis. 

 10-12. Successive stages of the same, showing outgrowth of 

 pro-embryonic whorl and origin of sexual plant. 



In all figures r.n. denotes root-producing node; i., principal 

 internodal cell ; w.n., node originating pro-embryonic whorl ; 

 p.w.y pro-embryonic whorl ; t.p., terminal process. 



