DESCRIPTION OF PLATES VIII and IX. 



{Sclerospora Maydis (Rac.) Butl.) 



Plate VIII. 



Top of maize plant affected with downy mildew, reduced to two-nintlis 

 natural size, and part of leaf of same in early stage, reduced to one-third. 



Plate IX. 



Two conidiophores, branched towards the top, the end branches 

 provided with papilla?, some of which bear spores. X 640. 



Early stages of spore formation. The young conidium is spherical. 

 X 640. 



Much branched conidiophore with conidia which have become 

 separated while mounting. X 320. 



Two germinating conidia. X 320. 



Cystic stage of a Protozoon found in the old leaf-sheaths of maize 

 plants and closely resembling the bodies stated by Raciborski to be the 

 oospores of Sclerospora Maydis. X 640. 

 Fig. 6. A maize plant affected by Sclerospora Maydis, showing the manner 



in which the leaves stand out stiffly from the stalk and the bunched 

 growth at the apex. Note the tip of the tassel appearing between the 

 topmost leaves. 



