WHITE-PIXE BLISTEll EUST. 15 



where extensive collections of the different species of Ribes were 

 located, and hence more species have been subjected to attack. 



In Europe the following species have become infected naturally: 

 Ribes aciculare Smith, R. affine H. B. K., R. alpinum, L., R. ameri- 

 canum Mill., R. aureum Pursh, R. hiehersteinii hybrid, R. hracteosum 

 Douglas, R. cynosbati L., R. divaricatum Douglas, R. glandulosum 

 Grauer, R. gordonianum hybrid, R. hirtellum Michx., R. irriguum 

 Douglas, R. menziesii Pursh, R. inissouriense Nuttall, R. multiflorum 

 Kit., R. nigrum L., R. niveum Lindl., R. odoratum Wendl., R. oxya- 

 canthoides L., R. petraeuin Wulf., R. reclinatum L., R. rotundifolium 

 Michx. , R. rubrum L., R. sanguineum Pursh, R. setosum Lindl., R. 

 triste Pallas, R. vulgare Lam. 



The names of species of Ribes of North America are based on the 

 treatment of the North American species by Coville and Britton in 

 "North American Flora" (22) and of species of the other continents 

 on that of Janczewski in ''Monographic des Groseilliers, Ribes L." 

 (60). For the sake of convenience the currants and gooseberries are 

 kept in the single genus Ribes. 



As recently as 1914 (136) the fungus had not been found in North 

 America attacking any wild species of Ribes. Since then it has 

 been foimd attacking an increasing number of wild Ribes, as addi- 

 tional species are subjected to infection by the spreading and multi- 

 phcation of the known outbreak areas and as new ones are dis- 

 covered. To date it is kno^vn to have been found attacking naturally 

 the following species of Ribes in the States and Provinces named: 



Ribes amencanum. (floridum). — Maine, New Hampshire, Vermont, Massachusetts, 

 Rhode Island, New York, Wisconsin, Minnesota, and Ontario. 



cynosbati. — Maine, New Hampshire, Vermont, Massachusetts, Rhode Island, 

 Connecticut, New York, New Jersey, Wisconsin, Minnesota, and Ontario. 



glandulosum (prostratum). — Maine, New Hampshii-e, Vermont, Massachusetts, 

 Connecticut, New York, Wisconsin, Minnesota, and Ontario. 



hirtellum. — Maine, New Hampshire, Massachusetts, New York, Wisconsin, and 

 Minnesota. 



irriguum.— "Nevf York. 



lacustre. — Maine, New Hampshire, New York, and Wisconsin. 



missowiense. — New York, Minnesota, and Wisconsin. 



nigi~um. — Maine, New Hampshire, Vermont, Massachusetts, Rhode Island, 

 Connecticut, New York, New Jersey, WiBconsin, Minnesota, Ontario, and 

 Quebec. 



odoratum. — Maine, New Hampshire, Vennont, Massachusetts, Rhode Island, 

 Connecticut, New York, Minnesota, and Ontario. 



reclinatum (grossulaiia). — Maine, Vermont, Massachusetts, New York. Wiscon- 

 sin, Minnesota, and Ontario. 



rotundifoHum . — N e w York . 



triste. — Maine, New Hampshire, Massachusetts, Wisconsin, Minnesota, and 

 Ontario. 



vulgare {rubrum). — Maine, New Hampshire, Vermont, Massachusetts, Rhode 

 Island, Connecticut, New York, Wisconsin, Minnesota, and Ontario. 



