The Dry Root-Rot of the Bean 1011 



was found on decaying potato tubers and was considered to be sapro- 

 phytic on that host. On the other hand, Carpenter (1915) refers to a 

 culture of Fusarium martii isolated from Pisum sativum by Westerdijk and 

 determined by Wollenweber, which evidently was considered to be parasitic 

 since it was thought by Miss Westerdijk to be F. vasinfectum var. pisi 

 Van Hall, the cause of the St. John's sickness of garden peas. So far 

 as is known, no inoculation experiments were made. Wollenweber shows 

 drawings of this strain in Fusaria autographia delineata, issued in 1916. 



The fungus isolated from diseased bean roots, and proved to be para- 

 sitic on this host, is practically identical with F. martii. The spore 

 measurements are approximately the same. The color production is 

 identical with that of F. martii and the pathogene in appearance agrees 

 remarkably well with the plates given by Carpenter (1915). The number 

 of septa in the conidia, and the proportion of conidia having the same 

 number, also are similar. One slight difference was observed. Appel 

 and Wollenweber state that 5-septate spores are rare, but they find a 

 sufficient number to give spore measurements and drawings. Sherbakoff 

 likewise finds as many as seven per cent of 5-septate spores on some 

 media. In the species under consideration, 5-septate spores were found 

 in less than one per cent. The fact that they occur in fewer numbers, 

 however, seems of small consequence and can scarcely be pointed to as 

 a distinct difference in the two organisms. Moreover, a culture of the 

 fungus from affected bean roots was sent for determination to Dr. Sher- 

 bakoff, who states, in a letter to the writer, that this fungus "is mor- 

 phologically the same as F. martii because of the same macroscopical char- 

 acters, the same type and size of conidia and of the same chlamydospores." 

 Slight differences that might occur he considers not sufficient to separate 

 this fungus from the above species. 



For comparison of the fungus under consideration with F. martii, 

 cultures of the latter were obtained at various times from several different 

 sources. The first culture received was from R. J. Haskell and was 

 originally from Dr. Sherbakoff, the latter having discarded his own cul- 

 tures; a second culture was supplied by the Bureau of Plant Industry 

 from Wollenweber 's collection; a third was from J. Westerdijk at the 

 Centralstelle fur Pilzkulturen. The macroscopical appearance of sub- 

 cultures from these were slightly different from the organism from bean 

 root. There was also a slight difference in appearance among the three 



