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Bremia lactucae Regel: Various stages in the life history of the fungus. 
A. —Condiophore bearing conidia and showing arrangement. 
B. —Single conidium. 
C. —Germination of conidium. 
D. —Conidium with zoospores ready for emergence. 
E. —Zoospore after emergence from conidium. 
F. —Zoospore germinating. 
G. —Stoma of lettuce leaf, showing origin of conidiophore. 
