Fig. 1. Smutted male spikelet with two flowers; the glumes 

 are all cut away. The stamens are sterile, the filaments do not 

 elongate, but the anthers are not smutted. A central smut-body 

 has formed (stippled). x5. 



Fig. 2. Normal female secondary axis, with spikelet at its 

 extreme base. About natural size. 



Fig. 3. Smutted female secondary axis, of greater length 

 than normal, with the diseased spikelets 2 cms. above the base. 

 About natural size. 



Fig. 4. Smutted female spikelet with two flowers, the glumes 

 all being cut away. The pales are left, that of the upper flower 

 being smutted. Note the elongate smut mass that replaces the 

 ovary (stippled). x5. 



Fig. 5. Smutted female spikelet as above. The lower sterile 

 glume is removed and the lower fertile glume is partly cut away. 

 The upper pale is hypertrophied and involved in the smut gall. 

 The galled ovary of this flower is bifurcate. x5. 



