75 



24 Journal of Mycology [Vol. 12: 



8. Puccinia substerilis E. & E. Fine material on Stipa 

 viridula collected in August, 1904, at Boulder, Colo., was sent 

 by Mr. Bethel, who also sent living plants of S. viridula and 5. 

 comata. This material showed a great abundance of amphi- 

 spores, 25 but almost no teleutospores. The amphispores gave 

 good germination, and were sown April 6 on S. viridula and 5. 

 comata. Uredospores of the usual kind began to appear on 5*. 

 viridula April 18, but no infection on S. comata. Another sow- 

 ing was made April 22 on *S\ comata, which also gave no infec- 

 tion. Uredospores continued to form for a month on S. viridula, 

 but no amphispores or teleutospores were produced. 



Mr. Bethel also sent fine teleutosporic material on Stipa 

 comata, collected in March, 1905, at Boulder, Colo. This was 

 sown on Aster ericoides April 18, and contrary to expectation 

 gave no infection. When the failure became assured, it was 

 sown again, April 29, on A. ericoides, A. multiilorus, and A. 

 Novae- Angliae, but in each case without infection. This nega- 

 tive result throws some doubt on the assumption that the Ameri- 

 can Stipa rusts on the several species of hosts belong to one 

 species, having its aecidia on certain species of Aster, 2 * and the 

 present very incomplete report is therefore entered under the name 

 P. substerilis. Reducing this name to a synonym of P. stipae, as 

 the writer did a few months since, 27 is now believed to have 

 been premature. 



9. Puccinia Seymouriana Arth. At the time this spe- 

 cies was published, 28 it was suggested upon grounds of spore 

 resemblance that its Aecidium was A. Cephalanthi Seym. From 

 combined morphological and geographical data I was then will- 

 ing to assert that "although cultures must be awaited, yet there 

 can be little doubt that the early stages of P. Seymouriana occur 

 upon Cephalanthus." Persistent efforts to secure material for 

 this trial were finally rewarded by the writer finding especially 

 good teleutospores on Spartina cytwsuroides at English Lake, 

 Ind., in the northern part of the state, in March, 1905. These 

 were sown on Polygala Senega April 20, with no infection, and 

 later on Cephalanthus occidentalis, May 13, with abundant 

 results. On May 18 great numbers of spermogonia began to 

 show, and on May 27 still greater numbers of aecidia, thus veri- 

 fying the prediction made three years before. 



10. Uromyces acuminatus Arth. Finding the aecidium 

 of this very common rust was due to a fortunate accident. Of 

 the many trials to find the connection between the two phases 



28 For description and illustrations of the amphipores in this species 

 see Bull Torr. Bot. Club 3^:38. 1905. 



26 For cultures of Puccinia Stipae see Jour. Mycol. 11 : 63. 1905. 



27 Tour. Mycol. 11: 11. 1905. 



28 Bot. Gaz. 34:12. 1902. 



