Jan. 13, igig 



Morphology of Urediniospores of P. graminis 



57 



O vo 



X X X X 



X X X X 



O vo O M 



X X X X X 



X 



X X X X X X 



X 



X 



M 



w 





8 



g 



til 



m m pq MpfpfpT 



PQ S CO 03 i-OQ - C 



p^ rt rt P^tap^w :z; 



Pi 



Pi" w 





^ tt: 





t& 







