Seaver : Some North Dakota Hypocreales 533 



asci and spores but otherwise correspond well with other specimens 

 of this species that have been examined. 



VII. Claviceps 



Claviceps purpurea (Fries) Tul. The species was collected 

 by the writer on several hosts including Broinus, Agropyron, and 

 cultivated rye, in the Agricultural College grounds. The fungus 

 is a parasite and besides causing some reduction in the crop is also 

 the cause of a characteristic disease among cattle. It is used as 

 an official drug under the name of ergot. 



New York Hotanical Garden. 



