STUDIES OF DISEASE PRODUCING SPECIES OF FUSARIUM. 219 



should be considered as more closely related to Fusarium than to 

 Sporotrichum. 



Cultures of the fungus which has been called F II from apple 

 showing both obovate, one-celled spores and septate spores were 

 sent to Dr. Peck in March, 1910, together with a letter calling 

 attention to the similarity of the apple fungus to that causing 

 carnation bud-rot and to the fact that in the cultures of the 

 fungus from apple large numbers of spores of the septate type 

 were present. In replying Dr. Peck stated that in describing 

 the fungi from June grass and carnation buds only material as 

 it occurs in nature was examined. For that reason only spores 

 of the obovate type were observed. Dr. Peck also said that he 

 knew of no genus which would properly include a fungus with 

 spores of both the Sporotrichum and Fusarium types. It may 

 be possible that the fungi with these two kinds of spores con- 

 stitute a group of species which should be placed in a new genus. 

 It is well known, however, that many species of Fusarium pro- 

 duce in culture large quantities of spores of such shape and size 

 as to place them in other genera if the classifications were based 

 on these spores which are usually called micrononidia. The 

 writer believes that the obovate spores in the group under con- 

 sideration should be regarded in the same way that the small 

 spores of a Cephalosporium type are regarded in certain species 

 of Fusarium and that the fungi with obovate spores agreeing in 

 other characteristics with Fusarium can safely be included in 

 that genus. 



As has been stated, a number of typical species of Fusarium 

 have been carried in culture side by side with the fungi already 

 discussed and used to some extent for comparison with them. 

 F. roseuui Lk. F XVIII, was isolated from scabby wheat which 

 was kindly sent to the writer from Ohio by Dr. Thomas Manns, 

 then of the Ohio Agricultural Experiment Station.* This fungus 

 produces a large amount of white aerial mycelium with bright 

 red color next to the culture medium. In appearance the cul- 

 tures closely resemble those of F II from apple but microscopic 

 . examination shows that the wheat scab fungus produces very 

 few spores in culture and none of these are nf the obovate form. 



* See foot-note p. 254. 



