126 
Mycologia 
especially not only the writer feels much indebted but the scien- 
tific public is placed under obligation. Among those who con- 
tributed in more or less degree to the studies of the present year 
the following are especially entitled to mention : Messrs. F. McAl- 
lister, I. M. Lewis and B. C. Tharp, Austin, Texas ; W. A. Archer, 
Mesilla Park, N. Mex. ; J. M. Bates, Red Cloud, Neb.; E. Bar- 
tholomew, Stockton, Kans. ; E. Bethel, Denver, Colo. ; J. F. 
Brenckle, Kulm, N. Dak.; H. L. Bolley, Fargo, N. Dak.; J. J. 
Davis, Madison, Wis. ; A. O. Garrett, Salt Lake City, Utah ; H. 
D. House, Albany, N. Y. ; H. S. Jackson, Corvallis, Ore. ; C. H. 
Kauffman and E. B. Mains, Ann Arbor, Mich. ; Roy Latham, 
Orient, N. Y. ; W. H. Long, Albuquerque, N. Mex. ; C. R. Or- 
ton, State College, Pa; J. L. Weimer and H. H. Whetzel, Ithaca, 
N. Y. 
To indicate the extent of the work in making the cultures here 
reported the following statistics may be given. There were avail- 
able Ii8 collections with resting spores, and i8 with active spores, 
i. e., taken from growing plants. Over 240 tests were made in a 
hanging drop to determine the germinating condition of the spores. 
Only 48 collections of resting teliospores could be brought to 
germination, from which no sowings were made, and 16 infec- 
tions secured. From the 18 collections of fresh spores 34 sow- 
ings were made, and 3 infections obtained No extra assistant 
was employed for the work, as has been customary in preceding 
years, but it was carried forward by the regular staff of the labora- 
tory, the larger share falling to Mr. H. C. Travelbee. 
Negative Results. — A number of collections giving good ger- 
mination of spores produced negative results when sown upon 
hosts which are presumably aecial hosts for the species, but pos- 
sibly not adapted to the racial material in hand. A few collec- 
tions of species, for which no definite suggestions were available, 
were sown upon the seemingly most likely aecial host. In both 
cases the lack of positive results appears worth recording. 
I. PucciNiA AMPHiGENA Diet., On Calamovilfa longifolia 
(Hook.) Hack., collected by Mr. E. Bethel at Colorado Springs, 
Colo., Oct. 18, 1914, and sent immediately to Lafayette, Ind., 
