PLATE 70 
A. —Cross section of normal part of leaf blade of Nymphaea odorata the diseased 
part of which is shown in B. X430. Photomicrographed by J. F. Brewer. 
B. —Cross section of leaf of N. odorata at four days after sowing of conidia of Helico- 
sporium nymphaearum from pure culture to upper surface of leaf. Note penetration 
of stomatal opening by germ tube of the fungus. X430. Photomicrographed by 
J. F. Brewer. 
C. —Cross section of leaf of N. odorata at four days after sowing of conidia of H. 
nymphaearum from pure culture to upper surface of leaf. Showing penetration of 
fungus through stomatal opening and further growth of hyphse in substomatal 
chamber. X430. Photomicrographed by J. F. Brewer. 
Compare figures A to C for progressive disintegration of cellular contents of host 
after entry of the fungus, coagulation of contents of epidermal cells and disintegration 
of nuclei and chlorophyll bodies. 
