80 



ORIGIN OF CORMOPHYTA 



[CH. 





la x 2 



5 X 2 





Fig. 43. Adiantitesfertilis, (White), from the Lower 

 Carboniferous of the United States. (1) Sterile 

 fronds (reduced). (2) Fertile fronds and seeds (all 

 natural size except where magnification is stated). 

 After White, " Fossil Plants of the Group Cycado- 

 filices," Smith's Misc. Coll., Vol. 47, 1905. 



