2l8 MAINE AGRICULTURAL EXPERIMENT STATION. I913. 



hand a number of cultures of typical Fusarium which could not 

 possibly be considered as belonging to the same species as the 

 fungi with obovate spores have been found to cause rot of car- 

 nation buds upon inoculation. It would seem that a number of 

 species can cause carnation bud-rot but that what appears to be 

 one morphological species isolated from different host plants has 

 certain strains which cause the rot and others which do not. 

 The fungus from fowl meadow grass seems identical with that 

 from June, grass yet it failed to attack carnation buds of the 

 same variety that were destroyed by the June grass fungus. F 

 II from apple and the sunflower fungus, F XIII, caused rot of 

 the buds which was exactly the same in appearance as that 

 caused by the June grass organism although they differ from it 

 in the production of a much larger proportion of septate spores 

 and might possibly be regarded as belonging more properly to a 

 different species. Fusarium putrefaciens, F XII, and F I from 

 apple caused rapid decay of carnation buds and there is no ques- 

 tion but that these are typical Fusarium forms. 



In the course of this study species of Fusarium have been 

 isolated or secured from a number of different sources and have 

 been carried through periods of growth on the same media as 

 the forms with obovate spores for comparison. Cultures of two 

 species of Sporotrichum, S. roseolum Oudem. and Beyer and 

 S. homhycinum (Corda) Rabenh. were secured from the Asso- 

 ciation Internationale des Botanistes and these have been carried 

 in culture for more than two years. These species bear little 

 resemblance to the fungi wdth obovate spores which are under 

 consideration as they produce almost no aerial growth on any 

 of the media on which they have been grown. The writer has 

 had little experience with the genus Sporotrichum, never having 

 grown but one other species in culture but after growing several 

 fungi of the same general group, if not strains of the same 

 species, as the carnation bud-rot fungus in comparison with a 

 number of typical species of Fusarium, some of which resemble 

 that fungus in certain characteristics, and taking into considera- 

 tion that Sporotrichum is a genus characterized by producing 

 one-celled spores while Fusarium is a genus in which different 

 types of spores are produced in a given species under dift"erent 

 conditions of growth, it would seem that this group of fungi 



