Ill 



northern part of British America and Alaska, and in the elevated 

 regions along the Rocky Mountain chain further South. 



The Brysiphe* in this Vol. (pp. 2-30) have been ela,borated and 

 prepared by Professor T. J. Burrill, of the University of Illinois, who 

 wishes here to express his thanks for contributions of much service 

 mostly specimens, to the following named gentlemen, viz.: F. W. 

 Anderson, J. C. Arthur, Geo. F. Atkinson, W. J. Beal, H. W. Hark- 

 ness, W. A. Kellerman, T. H. McBride, L. H. Pammel, C. H. Peck, 

 S. M. Tracy, Wm. Trelease, A. B. Seymour, and Geo. P. Clinton. 



We regard it as extremely fortunate that Prof. B. was willing to 

 ujidertake the editing of the Erysipheoe, as his previous studies in 

 this difiBcult Family have made him specially competent to do the 

 work thoroughly. 



The index of genera and species at the end of the volume is the 

 work of our friend W. C. Stevenson, Jr., to whom we are already 

 indebted for the indices of species and their habitats in the "North 

 American Fungi." 





