THE EVOLUTION OF PLANTS 



239 



_., Archigymno&permAe 



(Hypothetical) 



LLfCopsida- 



Pf-eropsida. 



Dawn \o/ the iFossi/^Ftecord 



/A/icestors of- 



FIG. in. Genealogical tree, showing the ancestral line of the modern 

 plant orders according to a polyphyletic hypothesis. Full explanation 

 in the text. (Cf. Fig. no.) 



