A.—Photomicrograph of an isolated lesion on the sheath of a Qoldcoin wheat plant artificially 
inoculated and grown in the greenhouse. X 16 
B.—Photomicrograph of a longitudinal section of a wheat root, artificially inoculated and grown in 
the greenhouse, showing the cells of the cortex filled with the mycelium of Ophiobolus graminis. x 160 
