THE FA'OLUTION OF PLANTS 



237 



11' ~~ 

 -s: * 

 -u O 



OAWN OF TH E 



OSSIL 



ECOHO 



/Ancestors of- Pnmofi 



FIG. no. Genealogical tree, showing the ancestral lines of the mod 

 ern plant orders, according to a monophyletic hypothesis. 

 planation in the text. (Cf. Fig. in.) 



Full 



ex- 



