FIG. 40. Claviceps purpurea , or ergot, i, ergot on 

 rye-grass ; 2, ergot on rye : the black, horn-like bodies are 

 stromata or sclerotia of the fungus, and bear theconidial 

 form of fruit ; 3, portion of conidial form of fruit pro- 

 duced on a stroma : the conidia are mixed with a sweet 

 substance attractive to flies ; 4, a stroma bearing the 

 stalked ascigerous form of fruit, after lying on the ground 

 throughout the winter ; 5, head or fertile portion of 

 ascigerous fruit, showing the warted surface due to the 



[Description continued on p. 1 18. 



