Nov. 1, 1925 
OpMobolus graminis and Take-All of Wheat 
825 
Histological studies were made from plants exhibiting various stages 
of infection and these showed that the parasite entered the unbroken 
epidermis of the underground portions of the leaf sheaths, culms, and 
roots. The parasite first destroys the cortex of the roots and later 
enters the central cylinder. It also destroys the leaf-sheath and culm 
tissues and later enters the vessels, but it does not appear to make 
much progress after it enters the vessels. 
These studies indicate that the bleaching of the aboveground 
E ortions of plants is not due to a systemic infection of the whole plant, 
ut to the cutting off of the food materials and water supply and pos¬ 
sibly to the toxic substances. 
LITERATURE CITED 
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( 1 ) 
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(5) 
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(ID 
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-and Davis, R. J. 
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