WHITE-PIFE BLISTER RtTST. 9 



Chelsea, London, in 1813, offered for sale plants "collected in Upper 

 Louisiana and principally on the River Missoiiric, North America." 

 There is reason to believe that these were Nuttall's plants. The 



I'iG. 7.— Outline map of the northeastern part of the United States, sho';\-tng (by black dots) the known 

 distribution of white-pine blister rust in North America to and including 1913. 



Fig. 8. — OutUno map of the northeastern part of the United States, sho%viug (by black: dots and cross 

 hatching) the known distribution of whito-pine bUster rust in North ^Vmerica to and including 1914. 

 The cross hatching in this and the following maps indicates areas which arc generally infected. 



plant of interest to us is listed as Ribes longifiorum, a new species 

 from the Missouri. This is now known as R. odomtum Wendland. 

 which is the common form generally cultivated in the eastern United 



