220 PHYTOPHTHORA PARASITICA. 



with Ph. parasitica. These successful cross inoculations show 

 that the fungus is the same in both these cases. 



The infection experiments show that some of the plants that are 

 susceptible to infection by Ph. omnivora, Ph. omnivora, var. Arecce 

 and Ph. Faberi can be inoculated by the Phytophthora under investi- 

 gation as well. Though seedlings of Clarkia elegans, Gilia nivalis 

 and mixed spp. and Schizanthus retusa and mixed spp. died of the 

 inoculation, no sporangia were found on them till they were placed 

 in water for about a day. Sporangia are, however, produced on the 

 surface of these seedlings when they are inoculated by any of the 

 above three named species. Coleman found not only sporangia but 

 oospores as well in the tissues of Clarkia inoculated with the areca 

 and cacao Phytophthoras, so did de Bary in seedlings inoculated with 

 Ph. omnivora. An important difference presented by the castor 

 Phytophthora from Ph. omnivora? Ph. omnivora, var. Arecw, 2 Ph. 

 Faberi and from Ph. Syringce* as well, lies in the former not inocu- 

 lating Cere-us even when wounded ; while the latter four readily 

 infect it and produce in its tissues oospores as well. Lepidium sati- 

 vum and Cleome are susceptible to the attack of Ph. omnivora, but 

 not to that of the castor Phytophthora. De Bary failed to inoculate 

 Solarium tuberosum and Lycopersicum and Coleman succeeded in 

 inoculating only their seedlings and those of Solarium Melongena. 

 My results are identical with Coleman's. Even though the castor 

 Phytophthora inoculated some of the hosts of Ph. omnivora, var. 

 AreccB and Ph. Faberi, still no relationship can be claimed for them 

 with the former as it failed to inoculate wounded and unwounded 

 fruits of cacao, and the cacao Phytophthora did not cross inoculate 

 seedlings and older plants of Ricinus. while areca nuts could be 

 inoculated only through wounds. Sporangia were not sessile as 

 those of the areca Phytophthora but they were borne on long 

 stalks. 



1 Klebahn, H. loc. cil., p. 09. Himmelbaur, \Y. Zur Kenntnis der Phytophthora, Aus- 

 dein Jahrbuch der Hamburgischen Wissenschaftlichen Anstalten, XXVIII, 1910, p. 41. 



2 Coleman, L. C. loc. cit., p. 178. 



3 Klebahn, H. loc. cit. Himmelbaur, W. loc. cit. 



