Bui, 934, U. S. Dept. of Agriculture. 



Plate I 



Pythium debaryanum from Artificial Cultures. 



Fig. l.— Hyphse, showing old portions of hyphse and false septa separating them from the portions still 

 containing protoplasm. Figs. 2 to 4.— Various stages of oospore formation. Figs. 5 to 8.— Hyphal 

 swellings at points of contact with glass. From camera-lucida drawings. 



