EXPLANATION OF THE PLATES. 



PLATE I. LONG SMUT (Tolyposporium filifenim Busse) : - 



Fig. 1. Portion of Millet Head showing long spore-sacs (natural 

 size). 



Fig. 2. Spore-sac opened to show filaments (natural size). 



Fig. 3. Spore ball. 



Fig. 4. Spores. 



Fig. 5. Spores germinating. 



PLATE II. HEAD SMUT ( Ustilayo reiliana Kuehri) : 

 Fig. 1. Smutted ear (natural size). 

 Fig. 2. Spores (x 650). 

 Fig. 3. Spores germinating ( x 650). 



PLATE III. GRAIN SMUT (Sphaceolotheca sorghi, Lk., CLINTON) : 

 Fig. 1. Smutted ear (natural size). 

 Fig. 2. Smutted grain. 



Fig. 3. Centra] portion remaining after^shedcling of spores. 

 Fig. 4. Spores ( X 650). 

 Fig. 5. Spores germinating ( x 650). 



Govt. Press 8937-1920-800 ex. 



