346 



DISEASES OF CULTIVATED PLANTS 



Spores globose, brown, 17-22 /*, border 1-1-5 /* not paler, 

 epispore with raised ridges anastomosing to form an irregular 

 network. 



The formalin method, recommended for loose smut of 

 oats, is effective in destroying spores adhering to the seed. 



FIG. 103. Tilletia tritici. i, ear of wheat 

 diseased ; 2, spore ; 3 and 4, spores germinating 

 and producing a germ-tube, bearing a cluster of 

 secondary spores at its apex ; 5, two secondary 

 spores that have conjugated or become united by a 

 short transverse neck ; one of the secondary spores 

 has produced a conidium. Figs. 2-5 highly mag. 

 (Figs. 3-5, after Brefeld.) 



Wheat sown in the spring is always more smutted than when 

 sown in the autumn. 



Brefeld, Unters. aus dem Gesamn. der Mykol., 5, p. 146. 



Tilletia /em's, Kiihn (= Tilletia foetens, Arthur), develops in 

 the ovary of wheat, like T. tritici, which it resembles in 



