330 PROCEEDINGS : BOSTON SOCIETY NATURAL HISTORY. 
P. A. Karsten, G. Massee, E. Rostrup; America , A. P. Anderson, 
J. C. Arthur, G. F. Atkinson, E. Bartholomew, H. L. Bolley, 
Stewardson Brown, T. J. Burrill, A. Davidson, J. J. Davis, F. S. 
Earle, Alice Eastwood, J. B. Ellis, A. W. Evans, W. G. Farlow, 
A. O. Garrett, David Griffiths, B. D. Halsted, R. A. Harper, 
E. W. D. Holway, H. H. Hume, L. R. Jones, W. A. Ivellerman, 
W. H. Long, J. B. S. Norton, L. H. Pammel, Flora W. Patter¬ 
son, S. B. Parish, C. Y. Piper, P. L. Ricker, H. F. Roberts, A. B. 
Seymour, R. Thaxter, S. M. Tracy, Wm. Trelease, M. B. Waite, 
A. F. Woods. B. L. Robinson, M. L. Fernald, and J. M. Green- 
man, of the Gray herbarium, have determined such hosts as were 
submitted to them. 
The preparation of the paper has been under the immediate direc¬ 
tion of Professors W. G. Farlow and R. Thaxter. To the latter the 
writer is indebted for aid at all points in its progress; to the former 
for the very free access to the specimens in the Cryptogamic her¬ 
barium of Harvard university, for the use of literature in his private 
library, for his kindness in looking up and verifying references, and 
for his ripe judgment on questions involving particular considera¬ 
tion. Too great acknowledgment cannot be given for the aid 
received from these mycologists. Mr. A. B. Seymour, Mr. E. W. 
D. Holway. and Dr. David Griffiths have also been of especial 
service. 
Besides access to the unrivaled sets of exsiccati, the general 
collection of Ustilagineae, and the Curtis herbarium at Harvard 
university, examination has been made of specimens at the Univer¬ 
sity of Illinois, the Cryptogamic herbarium of the U. S. department 
of agriculture, the Schweinitz specimens at the Philadelphia academy 
of natural sciences, the private collections of E. W. D. Holway, 
L. H. Pammel, David Griffiths, and the writer’s own herbarium. 
Partial examination was made of the specimens in the New York 
botanical garden. Through these sources and from the above 
botanists practically all of the species reported from North America 
have been seen and these included most of the types or authenti¬ 
cated specimens. 
The specific names presented here have been based mainly on 
priority of publication, though no especial effort has been made to 
dig up obsolete names to supplant those im general use. The names 
of the hosts are chiefly those of Gray’s Manual, sixth edition, since 
