WHEAT CI l Tl RE. 



339 



Fig. 6. — Loose Smut of Wheat, showing the various stages in the development of a smutted head. 



Heads emerging from boot (sheath), completely smutted mature heads, and bare stalk after spores 



blown off. 

 (U.S. Bureau Plant Industry. Bui. 152.) 



Fig. 7.— Longitudinal Section of a Fife Wheat Grain, 

 through the embryo and deepest part of the groove. 



The section shows the location of the embryo with 

 reference to the bran layei s. In an infected 

 grain the mycelium of the Loose Smut fungus 

 (Ustilugo tritlci) lives in the tissues of the 

 embryo. 



(a). Outer bran layer, i6« inner bran layer, G the 

 first root of the embryo, L the first leaf 

 (plumule), j sheath covering' bud end of the 

 embryo, O feeding organ (Scutelium). 



(Alter LolU-y ) 



