ANTHRACNOSE OF CUCURBITS. 15 



bit anthracnoses are caused by the same fungus. (4) The difficulty 

 in distinguishing the genera Colletotrichum and Gloeosporium on the 

 basis of the presence or absence of setae. (5) The morphological 

 similarity of conidial stages of all anthracnose fungi arid the necessity 

 of knowing the perfect stages in order to make specific distinctions. 

 (6) The question as to the validity of species erected upon the basis 

 of host relationships. 



The evidence that the bean and cucumber anthracnoses are not 

 identical has been augmented by numerous observations and cross 

 inoculations made in the course of the present work, and there seems 

 to be no further question as to the specific distinctness of the two. 

 Several unsuccessful attempts have been made to cross inoculate 

 with the causal organisms, and exposure of beans to natural infection 

 has yielded only negative results. 



The fungus of cucurbit anthracnose shows quite constant and dis- 

 tinctive cultural characters. The host relationships seem quite 

 definite and check up with cultural and morphological characters. 

 Upon the basis of host relationships as laid down by Edgerton (13), 

 there seems to be no reason to doubt that there is one well-defined 

 species of fungus causing the disease on the hosts listed. Since setse 

 are present in all of the strains studied during the course of this work, 

 it seems quite logical to retain until a perfect stage is discovered 

 Halsted's name Colletotrichum lagenarium, with the understanding 

 that it holds for only one of the two fungi to which Halsted applied 

 it. If, however, not much importance is attached to the presence 

 or absence of setse, the earlier name Gloeosporium lagenarium (Pass.) 

 Sacc. and Roum. may be retained. It appears to be purely a 

 matter of arbitrary choice between the two names. 



SYNONOMY. 



Colletotrichum lagenarium (Pass.) Ell. and Hals., 1893, in Bui. Torrey Bot. Club, v. 20, 

 p. 246-250; or 



Gloeosporium lagenarium (Pass.) Sacc. and Bourn., 1880, in Rev. Mycol., annee 2, 

 p. 200-202. 



Fusarium lagenarium Passerini, 1868, in Erbario Crittigamico Italiano, s. 2, no. 148. 



Gloeosporium reticulatum Roumeguere, 1880, in Rev. Mycol., annee 2, p. 169-172. 



Colletotrichum oligochaetum Cavara, 1889, in Rev. Mycol., annee 11, p. 191. 



RELATIONSHIP UNCERTAIN. 



Gloeosporium orbiculare Berkeley, 1876. 



Gloeosporium cucurbitarum Berkeley and Broome, 1882. 



Volutella citrulli Stoneman, 1898. 



MORPHOLOGY AND CULTURAL CHARACTERS. 



MORPHOLOGY. 



The morphology of this fungus has been described rather com- 

 pletely by various workers, such as Roumeguere (41), Cavara (8), 



