STUDIES OF DISEASE PRODUCING SPECIES OF FUSARIUM. 21/ 



In the same way material was examined from plants of red 

 top, Agrostis alba L., F XXV ; timothy, Phleum pratense L., 

 F XXVIII; and quack grass, Agropyron repens (L) Beauv., F 

 XXVI, which had been injured by the grass thrips. In all of 

 these, the fungus was found and isolations were made in each 

 case. A fungus, F XXX, showing the same characteristics was 

 also found associated with silver top of timothy collected in 

 Indiana in July 1911. Another, F XXIX, a typical species of 

 Fusarium was also isolated from some of the diseased culms 

 from Indiana. 



An ornamental grass, Phalaris arundinacea L. var. picta 

 growing on the University campus also showed the presence of 

 the fungus with obovate spores on the shrunken culms which 

 had been injured. 



The fungi isolated from these different grasses have the same 

 cultural characters. When they are grown side by side on the 

 same medium, it is impossible to distinguish one from the other. 

 They also agree very closely with the one from potato, F IX, 

 described earlier in this paper, with the fungus from sweet corn, 

 F VI, and with Barrett's Fusarium I from corn, F XXXVI, 

 from Illinois. Some work has been done to determine the 

 relation of these fungi to the carnation bud-rot by means of 

 inoculations of carnation buds. It will be remembered that 

 Stewart produced bud-rot of carnations with the fungus isolated 

 from June grass and from these results reached the conclusion 

 that the fungus from June grass and the one from carnation 

 buds should be regarded as one species, a conclusion which no 

 doubt is correct. In the inoculation work carried on by the 

 writer, there has been wide difference in the results obtained 

 with the very similar fungi from dift'erent sources. With the 

 fungi from June grass, F XXIV; red top, F XXV, and quack 

 grass, F XXVI, the proportion of decayed buds was so great as 

 to lead to the conclusion that if the decay of carnation buds is 

 taken as a standard by which to measure their relationship, they 

 would be regarded as one species. Some of the fungi which 

 seem identical with the one from June grass, F XXIV, in cul- 

 tural and morphological characters did not cause a rot of carna- 

 tion buds. These include the fungus from fowl meadow grass, 

 F XXVII, Barrett's corn Fusarium I. F XXXVI, and the 

 fungus with obovate spores from potato, F IX. On the other 



