STUDIES OF DISEASE PRODUCING SPECIES OF FUSARIUM. 23 1 



to a much greater extent than in any other fungus in this set 

 of cultures. In cultures one month old large numbers of spores 

 were found. These varied from non-septate spores 8 microns 

 in length to spores 47 microns in length with 5 septa. The 

 spores of this fungus are very similar to those of Fusarium I 

 from apple. 



A strain of Fusarium, F XI, which was isolated from an 

 apple which was decaying on the tree August i, 19 10, and 

 another, F VIII, isolated from wheat collected at Orono in 

 Septemjber, 19 10, were so similar to Fusarium I from appl'e 

 when the three fungi were grown on beet cylinders that they 

 could not be distinguished when placed side by side. 



F. roseum, F XVIII, from wheat produced a luxuriant 

 growth of white aerial mycelium and bright red color developed 

 next to the medium. There was slightly more aerial mycelium 

 than in the cultures of the fungi with obovate spores. Careful 

 examination of material from these tubes showed only a few 

 spores. 



A fungus, F XVII, isolated from decaying ears of yellow 

 dent corn sent from Indiana produced a growth very similar 

 to that of F. reseum but there was some yellow color as well 

 as red in the fungus from corn. 



The species of Fusarium from cucumber, squash, and tomato 

 grew well on- beet cylinders but the amount of aerial mycelium 

 was small in comparison with that of the forms which have been 

 described and the color was white. 



The 3 strains from cucum'ber seem to be distinct species 

 although they agree closely in certain characters. One strain, 

 F VII, has agreed closely with F. oxysporum, F XV and F 

 XVI, from potato. On certain media this fungus has produced 

 some purple color. Chlamydospores were formed in the cul- 

 tures on beet cylinders and the conidia were of the one-celled 

 type for the most part. One of the other strains from cucum- 

 ber, F XIX, has agreed with this in spore characters but the 

 color has remained white except for some brown in old cultures. 

 The third form, F XX, produces less aerial mycelium than the 

 others, the conidia are mostly three-septate and chlamydospores 

 occur in the cultures. The first two forms would seem to be 

 closely related to each other and to F. o.vysporum as described 



