STUDIES OF DISEASE PRODUCING SPECIES OF FUSARIUM. 211 



example material of F II collected as it occurs naturally in 

 decaying apples may show in some cases practically all spores of 

 the septate Fusarium type while in other cases the obovate 

 spores predominate. A description of the fungus which took 

 into consideration either of these conditions without regard to 

 the other would not be complete. 



Soon after it had been determined that the difTerent spore 

 forms belonged to this fungus, the writer read Stewart and 

 Hodgkiss'* account of the Sporotrichum Bud-Rot of Carnations 

 and the Silver Top of June Grass. Stewart isolated a fungus 

 from decaying carnation buds, studied it in culture and carried 

 on inoculation experiments in which he proved that it caused the 

 rot of the buds. Diseased buds were sent to Dr. Peck who 

 described the fungus as a new species, Sporotridnim antho- 

 pJiihiin. Some time before this, Stewart had found a similar 

 fungus associated with the silver top of June grass which Dr. 

 Peck had named Sporotrichum poae. The descriptions of both 

 species were based on material as it occurs in nature. 



When Stewart grew the fungi from the two sources in culture, 

 it was found that they gave exactly the same kind of growth on 

 a number of media. Both were characterized by the production 

 of a large amount of white aerial mycelium and by red color 

 next to the medium. The spores in both were obovate to pyri- 

 form with occasional septate spores of the type of Fusarium 

 macroconidia. By means of inoculations, he showed that the 

 fungus isolated from June grass would also cause the rot of 

 carnation buds and therefore concluded that the two species, 

 S. poae and S. anthophihim should be regarded as one species 

 which should be called S. poae because that species name was 

 used earlier than the other. 



The writer was impressed by the striking similarity of the 

 carnation bud-rot fungus and the fungus from apples which has 

 been referred to as F II. The fungus from apples agrees with 

 the description of the one from carnations and June grass in its 

 rapid growth, production of a large amount of white aerial 

 mycelium, production of red color on a number of media and m 



* Stewart, F. C, and Hodgkiss, H. E. The Sporotrichum Bud-Rot 

 of Carnations and the Silver Top of June Grass. N. Y. Agr. Exp. Sta. 

 Technical Bulletin No. 7, IQ08. 



