PLATE 67 
A. —Leaf of Nymphaea tuberosa at 1 week after sowing conidia' of Helicosporium 
nymphaearum (isolation 205) on upper surface. Note lighter halo around diseased 
spots. Inoculation of July 7, 1914. X0.37. Photographed by J. F. Brewer. 
B. —Leaf of Nymphaea sp. showing spots due to natural infection with Helicosporium 
nymphaearum. X0.37. Photographed by J. F. Brewer. 
C. —Cross section of young sclerotium of Helicosporium nymphaearum from a com- 
meal-agar culture.r X 200. Photomicrographed by J. F. Brewer. 
D. —Sclerotium of H. nymphaearum from com-meal-agar culture kept at laboratory 
temperature for 7 months. Showing germination at 12 hours after sowing in the 
petri dish of corn-meal agar. X30. Photomicrographed by J. F. Brewer. 
E. —Cross section of old sclerotium. developed in a com-meal-agar slant culture. 
X60. Photomicrographed by J. F. Brewer. 
