EXPLANATION OF PLATE VI. 



Fig. 1. Hyphse in the tissucM of papaya stem. 500 X. 

 „ 2. Same a little mote enlarged. 750 X. 

 „ 3. Branching of mycelium in the rhizome of ginger showing the swelling 



before crossing cell walls. 500 x. 

 „ 4. Penetration of a hypha through the epidermal cell in the leaf-sheath of 



ginger. 750 x. 

 „ 5. Early stage of oospore fomaation from the ginger strain. 500 X. 

 Figs. 6 to 8. Oospores from the ginger strain. 750 X • 

 „ 9 to 12. Oospores from the tobacco strain. 750 X. 

 „ 13 to 14. Grermination of oospores from the tobacco strain. 750 x . 



