234 DISEASES OF FIELD & GARDEN CROPS. [CH. 



normal form is similarly enlarged. The variety differs 

 from the typical form in being whitish or yellowish 

 instead of pale purple in colour, and in the perithecia or 



Fiu. 107. 



Claviceps purpurea, Tul., var. Wilsoni, "W.Sm., growing from Ergot 

 Natural size. 



conceptacles being almost free on an elongated clublike 

 growth instead of being immersed in a globular head or 

 stroma. Many of the growths of the variety Wilsoni, 



FIG. 108. 



Claviceps purpurea, Tul., var. Wilsoni, W.Sm., growing from Ergot. 

 Enlarged 5 diameters. 



W.Sm., are hair-like, others are attenuated upwards from 

 a thicker base and bear no perithecia. The whole growth is 

 less firm than the type, and instantly reminds one of an ab- 



