256 MAINE AGRICULTURAL EXPERIMENT STATION. I913. 



Section Sporotrichella : F. poae. 



Dr. A\'ollenweber makes the following comments with regard 

 to certain species. 



"F. culinorum W . G. Smith is identical with F. ruhiginosum 

 App. and Wr. 



F. citrinum is a new species, differing from F. orthoceras 

 App. and Wr. mainly in the absence of a blue color but the pres- 

 ence of a citric color of the mycelium thallus grown on sterilized 

 potato tuber. 



F. discolor var. majus is a variety of F. discolor App. and 

 Wr. having larger conidia and a higher average septation. This 

 variety needs further study as well as F. argillaceum, F. reticu- 

 latuin. F. piriiniin and F. helianthi. The latter species described 

 as F. roscuin var. helianthi by Saccardo is interesting by the 

 presence of a pyriform microconidial stage, which shows some 

 relation to the corresponding stage of F. poae. 



The rest of the species have been partly described in Appel 

 and Wollenweber, Grundlagen einer Monographic der gattung 

 Fusarium, 1910, and partly by the latter author in 'Studies on 

 the Fusarium Problem.' Phytopathology, 1913. In this latter 

 paper the sections mentioned above are given with the excep- 

 tion of Sporotrichella, which might be provisionally established 

 for species with small globose to p^adform but also sickle- 

 shaped, septate conidia of the type of F. poae (^ Sporotrichum 

 poae)." 



In studying the combined results of these investigations two 

 interesting facts are presented First it is apparent that in some 

 instances quite a number of different forms or species of Fusa- 

 rium have been found associated with the diseased tissues of 

 the same host plant, and second that some are quite omnivorous 

 in their habits and occur upon several hosts. Since the great 

 majority of the species of this genus are saprophytes or are at 

 most wound parasites these observations are by no means new 

 or novel. However, these facts may be of considerable impor- 

 tance from an economic standpoint and they are much more 

 apparent when the strains of Fusarium studied are arranged in 

 the form of a host index and in the form of a list which gives 

 the number of different hosts from which the same strain was 

 isolated or in which it was found capable of causing disease 

 upon inoculation. 



