xv.j MILDEW OF TURNIPS AND CABBAGES. 



FIG. 30. 



Peronospora parasitica, Pers. 



Spore and Conidiophore emerging through an organ of transpiration. 

 Enlarged 1000 diameters. 



like the Peronospora of the potato, it produces oospores or 

 resting-spores ; the resting-spores act as seeds, and carry 

 on the life of the fungus in a hibernating state through 



