8 Journal of Mycology [Vol. 14 



go to the right spots. The second trip was to Colorado where 

 collections were made April 27 at Boulder, May i at Glenwood 

 Springs and May 2 at Wolcott. Unusual success attended this 

 search for material, due in large part to the solicitous assistance 

 of Mr. E. Bethel, of Denver, President of the Colorado Academy 

 of Science, who accompanied us to Boulder, and gave detailed 

 directions for finding infested trees at the other places. Mr. 

 Bethel's intimate knowledge of the localities, and his own exten- 

 sive observations upon these and other rusts of Colorado, all be- 

 ing placed at our disposal, made the few days of our stay in the 

 state remarkably rich in results. The species of Gymnosporan- 

 gium and Roestelia obtained upon this trip were found upon 

 subsequent study to be in part quite distinct from the well known 

 species to which they have heretofore been referred, and in part 

 entirely new discoveries. These forms have recently been named 

 and characterized by Mr. Kern,^ and two of the species, G. Beth- 

 eli and G. hiconspicuum, have been successfully cultivated. 



For the third time the Botanical Society of America gener- 

 ously made a grant to forward this series of studies. This year 

 it was sufficient to pay in large part for the assistance needed in 

 testing the viability of spores, making the sowings, and recording 

 the results, the balance being supplied by the Indiana Experiment 

 Station. 



The work was done by Mr. Frank Vasku, a senior student of 

 the University of Iowa, recommended by Professor T. H. Mac- 

 Bride. Like the two previous men from the Botanical Depart- 

 ment of the University of Iowa, who have assisted in this work, 

 Mr. Fred. J. Seaver in 1903 and Mr. F. D. Kern in 1904, Mr. 

 Vasku showed exceptional skill in conducting this class of work. 

 His quick understanding of the ])roblems, careful and accurate 

 manipulation, and untiring devotion, were large factors in de- 

 termining the amount and value of the season's results. Most of 

 the sowings of Gymnosporangium spores were made by Mr. 

 Kern, who took an especial interest in this part of the work, as 

 it bore upon the subject of a thesis in preparation for the mas- 

 ter's degree. 



In order to study as many species as possible from a wide 

 range of localities, and in this way to investigate the North 

 American rust flora as a whole, it is necessary to depend upon 

 the good will and generosity of contributors for much of the cul- 

 ture material and for hints regarding probable alternation of 

 hosts. Those who have aided the work this year are Rev. J. 

 M. Bates, Red Cloud, Neb., leading with 30 collections of cul- 

 ture material, and Messrs. E. Bethel, Denver, Colo., W. A. Kel- 

 lerman, Columbus, Ohio, T- Dearness, London, Ont., C. W. Edg- 

 erton. Ithaca, N. Y., A. "O. Garrett, Salt Lake Citv, Utah. H. 



'Bulletin Torrcy Club ^4:459-463. 1907. 



