EXPLANATION OF PLATE I. 



Appearance of Some Smut Diseases. 

 (All figures of natural size.) 



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



Fig. 2. Loose Smut of Barley, naked form, U. nuclei (Jens.) Kell. & Sw. 



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



Fig. 4. Leaf Smut of Rye, Urocystis occulta (Wallr.) Rabh. 



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

 maydis (DC.) Ccla. 



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

 Trel. 



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