EXPLANATION OF PLATE I. 



Appearance of Some Smut Diseases. 

 (All Jtgures of natural si.te.) 



Fig. 1. Loose Smut of Oats, Ustilago Avenai (Pers.) Jens. 



Fig. 2. Loose Smut of Barley, naked form, U. nuda (Jens.) Kell. & S\v. 



Fig. 3. Loose Smut of Wheat, U. Tritici (Pers.) Jens. 



Fig. 4. Leaf Smut of Rj'e, Urocystis occulta (Wallr.) Rabh. 



Fig. 5. Smut of Corn in the staminate flowers or "tassel," Ustihojo 

 maydis (DC.) Cda. 



Fig. 6. Stinking Smut or "Bunt" of Wheat, Tilletia fastens (B. & C.) 

 Trel. 



[248] 



