22 



paper some of the more interesting results that have come to 

 h'ght pertaining to the forms on roses. 



Very little has been learned about the Californian Caeonia. It 

 s clearly an aecial stage of the type of Caeoma nitens on Rtibtts, 

 and like it may belong to the genus Gyvinoconia. But as no hint 

 has yet been secured regarding the telial stage, the assignment to 

 any other than a form-genus is hazardous. 



^os- 



ni 



vO/ 



III 



1 



II 



Fig. I. Spores of the three species of Phragmidium on rose having slender 

 eliospores : l, P. americanum, 2, P. Rosae-seiigerae, 3, P. Rosae-californicae ; 

 I, aeciospore, II, urediniospore, III, teliospore. 



The characters of the rust which has been called Phragiuidiiim 

 speciosiun, such as the non-gelatinous pedicels of the teliospores, 

 the large, compact telia, found on the stems, and the absence 

 of a uredinial stage, show that it does not accord with true 

 members of the genus Phragmidium, and justify its separation 



