190 Journal of Mycology [Vol. 13 



cycle has now been worked out for the first time, the one hav- 

 ing the greatest economic import does not belong to the grass 

 or sedge forms, but inhabits flax. The discovery of the full 

 developmental history of this serious menace to successful flax 

 growing, brought about by the cooperation of Professor Henry 

 L. Bolley of North Dakota, widely known for his interest and 

 scientific studies in promoting the flax industry, has been a matter 

 of much satisfaction. It greatly clarifies the problem of con- 

 trolling the flax rust in the interest of the cultivator. 



The work of testing the viability of spores, making the 

 sowings, and recorded data, required, as in previous years, the 

 undivided attention of a person to whom the whole work could 

 be intrusted. The expense of such an assistant was this year 

 met by a grant from the Botanical Society of America. It was 

 the second time the Society has given material aid to this series 

 of investigations. 



Through the kindness of Professor R. A. Harper, I was 

 so fortunate as to enlist the interest of Dr. E. W. Olive, lecturer 

 at the University of Wisconsin, who consented to supervise 

 the season's work. The forethought and constant watchfulness, 

 the enthusiastic application, and especially the maturity of judg- 

 ment and breadth of knowledge brought to bear on the work by 

 Dr. Olive materially increased the completeness of the results. 



As in former years correspondents have provided much 

 of the material used in the trials, partly upon their own initiative, 

 and partly in response to suggestion, for all of which I am under 

 heavv obligation. Teliosporic material was sent bv Messrs. A. 



D. Selby, Wooster, Ohio : H. H. Whetzel, Ithaca, N. Y. ; Chas. 



E. Fairman, Lyndonville, N. Y. ; W. A. Kellerman, Columbus, 

 Ohio; H. L. Shantz, Columbia, Mo.; J. J. Davis, Racine, Wis.; 

 John L. Sheldon, Morgantown, W. Va. ; H. L. Bolley, Agricul- 

 tural College, N. D. ; E. Bartholomew. Stockton, Kans. ; Geo. 

 E. Morris, Waltham, Mass.; Guy W. Wilson, Lafayette, Ind. ; 

 E. Bethel, Denver, Colo. ; and especially by Rev. J. M. Bates, 

 Red Cloud, Neb. Aeciosporic material was sent by Messrs. Her- 

 man von Schrenk, St. Louis, Mo. ; H. H. Whetzel, Ithaca, N. Y. ; 

 C. L. Shear, Tacoma Park, D. C. : D. Reddick, Ithaca, N. Y. ; 

 and P. H. Rolfs. Lake City, Fla., all the collections being either 

 Caeoma or Peridermium on species of Pinus. Host plants are 

 often required for the work, which do not grow in this vicinity, 

 and can not be purchased from dealers, and for a number of 

 such plants in good growing condition I am indebted to Messrs. 

 William Trelease of the Missouri Botanical Garden. St. Louis, 

 Mo. ; John L. Sheldon, Morgantown. W. Va. ; P. B. Kennedy, 

 Reno, Nev. ; and J. J. Davis, Racine, Wis. 



During the present season 94 collections of material with 

 resting spores and 15 collections with active spores were em- 

 ployed, from which 293 drop cultures and 6 Petri dish cultures 



