THE FERN'S PLACE IN NATURE. 



59 



GYMN08PERM/E 



SELAGINELLACE/C 



laOETACE* 



POLVPOOIACE-t 



ePHAQNACE^ 



PHYCOMYCETES 



BROTOCOCCOiDE;C 



Provisional Pedigree of the Leading Groups of Plants. 



