I KiTYSTIS. 



315 



Urocystis OCCUlta (Wallr.). i I'.ritain ami I'.S. America.) This 

 species is common on the haulms, l.-avi-s Icai'-sht-atli-. ami less 

 ly on floral parts \' ,s'W. cerealt (rye). It causes tin.- 



17J. / i Rye. 1 



riiiai ion i.r grey -m|'-, i'rim whii'h a Mark spore-powder 



peg. Tin- haulms liccnmi- ilix-a-fil ami smully, tln'i'i-liy 



of the car, uhirh remain- >Iuiiti-il ami 



