PLATE 9 
Photomicrographs of late stages of infection of male blossom buds by germinating 
conidia. 
A. —Deep indentation produced by an appressorium. Infection has already 
occurred elsewhere in the bud and host tissues are disorganized. Section rather 
thick, about 25 n. Note clinging together of the hyphae, indicating a tangled weft, 
capable of withstanding considerable pressure. 
B. —Another view of tangled hvphae, and indentation beneath an appressorium. 
C. —Hyphae of the fungus within the disorganized host tissue. The large, round 
bodies below are partly developed anthers. 
Photomicrographed by the photographic laboratory, United States Department of 
Agriculture. 
