FIG. 87. Tilletia caries, a species parasitic 

 on wheat, i , ear of wheat diseased ; 2, spore ; 

 3, 4, spores germinating and producing a germ- 

 tube bearing a cluster of secondary spores at the 

 tip ; 5, two secondary spores that have con- 

 jugated or become united by a thin transverse 

 tube : one of the secondary spores has produced 

 a conidium. (Figs. 3-5 after Brefeld.) Fig. i, 

 nat. size ; remainder highly mag. 



