PLATE II 



Old sheaths and culms of com showing effects of severe attacks by Physoderma zeae- 



maydis: 



A, B. — Badly diseased stalks broken over at weakened, infected lower nodes. 

 These are the effects of the disease in regions where it is most destructive. 



C, E. — Portions of old attacked sheaths showing characteristic shredding. These 

 old infected sheaths contain countless lumbers of resting spores which become freed 

 and are then blown and washed about %vhen sheaths become weathered and shredded. 



D. — Portion of an old infected stalk showing discoloration both on outside and in 

 pith due to the attacks of the fungus. Numerous spores are found in all attacked 

 portions. 



