244 
Mycologia 
tions are treated in essentially the same way as those on Carex. 
It may also indicate to collectors the desirability of including in 
rust collections such parts of the hosts as best serve to permit of 
their independent verification or determination. Possibly some 
idea may be gleaned of the labor and time which such a work 
entails. As the completeness of the work rests upon the avail- 
ability of material, it is hoped that in the interests of mycologists 
in general those who possess either recent or old collections of 
rusts may contribute duplicate sets when convenient to do so. 
Purdue University, 
Lafayette, Ind. 
