FIG. 85. Urocystis occulta, one of the Ustilaginaceae. 

 i, upper part of a rye plant attacked by the fungus ; 2, 

 clusters of spores, one of which has germinated and pro- 

 duced a cluster of secondary spores ; 3, a spore that has 

 germinated and produced secondary spores, two of which 

 have germinated, a. Fig. i, reduced ; the others mag. 



