PLATE 17 



Phomopsi? kalmiae: 



A. — Section through a sterile pycnidium, shomng an area containing nucleated 

 hyphae. From such areas spores arise when the pycnidium is transferred to a suit- 

 able medium. X 200. 



B. — Central portion of figure i more highly magnified. X 625, 



C. — Section through a sterile pycnidium, showing growth beginning at the margins 

 after it had been transferred to a more suitable medium. X no. 



Photomicrographs by the writer. 



