PLATE 48 



Longitudinal section through young secondary root of wheat embryo, showing 

 presence of intracellular mycelium. The fungus here is probably a species of Hel- 

 minthosporium. This mycelium is larger and more vacuolated and breaks down 

 the cells of the host much more completely than does the rust mycelium. (See 

 PI. 42 for comparison.) X255. 



