THE FERN'S PLACE IN NATURE. 



GYMNOSPERM/C 



SELAGINELLACE/C 



ISOETACE/t 



POLYPODIACE/E 



SPHAGNACE/E 



PHYCOMYCETES 



iROTOCOCCOIDE/E 



PROVISIONAL PBDIGREK OF THE LEADING GROUPS OF PLANTS. 



