PHYLOGENY 



75 



CRONARTIACE.E. 



A. Teleutospores in pulvinate sori. Chrysomyxa. 



B. Teleutospores in columnar sori. Cronartivm. 



COLEOSPORIACE.E. 



A. Basidiospores fusiform. Uredospores formed singly. Ochropsora, 



B. Basidiospores ellipsoid or lemon-shaped. Uredospores in chains. 

 JScidia with an inflated peridium. Coleosporium. 



C. Basidiospores globose. Basidium ultimately protruded. Teleuto- 

 spores with lateral pedicel. Zaghouania. 



EXDOPHYLLACE.E. 



.Ecidio-teleutospores in a cup-shaped peridium, germinating with an 

 external basidium. Endophyllum. 



PUCCINIACELE. 



A. Teleutospores embedded in gelatine, on C4ymnosperms. No uredo- 

 spores. Gymnosporangium. 



B. Teleutospores free, on Angiosperms. 



a. Teleutospores of more than two cells. 



1. Teleutospores of many cells. No uredospores. Xenocloclms. 



2. Teleutospores of several cells, dark-coloured. Caeomata en- 



circled by paraphyses ; uredospores the same and with 

 paraphyses intermixed. P hragmidium. 



3. Teleutospores of several cells, faint-coloured. Caeomata with- 



out paraphyses ; uredospores often with them. Kuehneola. 



4. Teleutospores of three radiating cells. Triphragmium. 



b. Teleutospores of one or two cells. 



1. Teleutospores of two cells, usually. Puccinia. 



2. Teleutospores of one cell. Uromyces. 



PHYLOGENY. 



In trying to comprehend the phylogenetic evolution of this 

 group of Fungi, there are several landmarks which can be 

 borne in mind. In the first place, their strict parasitism 

 implies a very close adaptation between them and their hosts : 

 this is not only a priori probable, but is confirmed by culture- 

 experiments and the existence of biological races. Therefore 

 those which are parasitic on the lowest hosts must be, on the 

 whole, most similar to the primitive forms, and those parasitic 



