EUTHALLEPHYTA— EUMYCETES— OOMYCETES 207 



VULi*, 



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

 containing the oospores of Sclerospora 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, Ciiarlotte M. King. 



