DISEASES IN GREENHOUSE 105 



help identify the fungus could be dis- 

 covered. Crush cultures were made at 

 once from the diseased material. Some 

 forty poured plates of nutrient agar were 

 made. In five days a pure culture of a 

 fungus appeared in all the plates with the 

 exception of one, which showed a Fusa- 

 rium. The cultures were watched closely 

 and in two weeks perithecia developed. 

 The fungus proved to be an ascomycete 

 belonging to the genus Chsetomium, and 

 determined by Mrs. Flora Patterson ;as 

 C. spirochczte Patt. In mid winter of that 

 same year, more diseased specimens were 

 sent in to my laboratory by a grower in 

 Illinois. These were greenhouse plants 

 showing the same symptoms as those ob- 

 served on the plants sent by Professor Beal. 

 Cultures made from this material gave the 

 typical fungus Chsetomium spirochaete. 

 A search through the literature showed that 



