PLATE 15 



A. — ^A leaf of Kalmia latifolia enlarged 13 times to show the character of the pyc- 

 nidia of the fungus on its host. Photographed by Mr. James F. Brewer. 



B. — A stem of Kalmia latifolia 40 days after inoculation in leaves only. The 

 plant was kept under very moist conditions, which favored the production of pycnidia. 

 Spores in the form of cirri may be seen extruding from the pycnidia. Xs- 



C. — Photomicrograph showing both kinds of spores of Phomopsis kalmiae, from 

 culture on com meal. Note the relative staining properties of the two types. A 12 

 ocular and a 4 objective were used. The stain was Delafield's hematoxylin and 

 eosin. X 695. Photomicrograph by the writer. 



D. — Section through a pycnidium of Phomopsis kalmiae on leaf of K. latifolia. 

 Note the superficial character of the pycnidium and its ostiole, from which the spores 

 lying to left have been extruded. X 92. 



E. — The ordinary type of spore of Phomopsis kahnias more highly magnified (12 

 ocular and 2 mm. oil-immersion lenses). Photomicrograph by the writer. X 1,200. 

 41813°— 18 5 



