EUTHALLEPHYTA EUMYCETES OOMYCETES 207 



XUC.U. 



Fig. 51. At the left, leaf of Green Foxtail (Setaria riridis). 

 containing the oospores of Sclerosf>ora graminicola, a single spore 

 at a. After Trelease. At the right, spike affected by the same 

 fungus: b spikelet enlarged. The figure at the right, oospores from 

 Hungarian grass; oog Oogonium, oos oosphere; oo Oospore. 

 The middle figure, Halsted; the right hand. Charlotte M. King. 



