STUDIES OF DISEASE PRODUCING SPECIES OE FUSARIUM. 213 



obovate spores in the other. The illustrations of the fungus in 

 the later publication show no septate spores of the Fusarium 

 tyi>e. 



The writer tried to secure a culture of the fungus but it was 

 no longer available. Dr. Heald kindly offered, however, to 

 examine cultures of the apple fungus ahd give his opinion as to 

 its identity with the one which he had studied in connection with 

 carnation bud-rot. After growing the apple fungus for some 

 time he reached the conclusion that it was very similar to his 

 carnation bud-rot fungus and should probably be regarded as 

 belonging to the same species. 



Soon after noticing the similarity of the carnation bud-rot 

 fungus and the apple rot fungus which had 'been designated as 

 F II, inoculation experiments were begun in which the one from 

 apple was tested on carnations in order to determine whether it 

 would cause bud-rot. A detailed account of the inoculations and 

 the results is given later in this paper. Here it is sufficient to 

 say that as the result of these inoculations it was found that 

 not only F il would cause the rot of the buds but that what 

 appear to be closely related fungi isolated from other hosts can 

 also produce the same disease. It was also found that certain 

 typical species of Fusarium were capable of causing the destruc- 

 tion of the buds. 



Fungi of the same type as the carnation bud-rot organism 

 seem to be quite widely distributed in nature. The question of 

 whether these are to be regarded as strains of one species or as 

 closely related species is a difficult one. A fungus which is very 

 similar to the one associated with the carnation disease was 

 isolated from an ear rot of corn in Illinois and described by 

 Burrill and Barrett.* This fungus which they called Fusarium I 

 from corn produced a large amount of white aerial mycelium 

 which later shows red color next to the culture medium. It was 

 described as producing spores of two kinds, obovate to pyriform 

 microconidia and septate macroconidia of Fusarium. 



In the fall of 1910 the writer asked Dr. Barrett if it would be 

 possible to obtain a culture of this fungus for comparison with 

 the apple decay fungus. At that time the cultures had been 



* Bun-ill, T. J., and Barrett, J. T. Ear Rots of Corn. 111. Expt. Sta. 

 Brl. 133, p. 86, 1909. 



