49^ 



March 1905] Cultures of Uredineae in 1904. jm 



Rev. Bates says : "Last spring I found TEcidium on Clcomc 

 scrrulata in two nearby localities, and on Chcnopodium album, 

 closely associated with the rust on Distichlis spicata, and no 

 other. Now I have it again under same conditions. I wrote 

 Mr. Hoi way about it and shocked him ; he does not think it 

 possible. But J am well convinced that it is the same as on 

 Chenopodium" [proved by cultures in 1902 from Distichlis-rust 

 sent by Rev. Bates]. Further reasons were given for believing 

 that the Clcomc and Chcnopodium aecidia came from teleuto- 

 spores on Distichlis, among them being that "last year I watched 

 for the uredo from it on the Distichlis, and got it May 21, after 

 collecting the first Clcomc aecidia May 5." All these observations 

 seemed very convincing, yet the deductions seemed very improb- 

 able. Fie followed up the statements by sending seedling plants 

 of Clcomc scrrulata and Chcnopodium album on which the large, 

 brilliant orange-colored aecidia occurred in remarkable profusion, 

 and so much alike that in appearance and structure they had to 

 be pronounced identical. As the season progressed Rev. Bates 

 also sent freshly collected specimens of aecidia on Roripa sinu- 

 ata (Nutt.) Hitch., Sophia incisa (Engelm.) Greene, and Sa Iso la 

 Tragus L., which he considered belonged to the same inclusive 

 species. The results of my cultures confirm the above clever 

 observations, and add still other hosts for the aecidium. The 

 data are as follows : 



May 17, Sown on Chcnopodium album; May 25, spermogonia ; June 5, 



aecidia. 

 May 17, Sown on Clcomc spinosa; May 25, spermogonia; May 30, aecidia. 

 May 17, Sown on Lepidium apctalum ; May 25, spermogonia ; June 7, 



aecidia. 

 May 30, Sown on Lepidium Virginicum; June 7, spermogonia; June 16, 



aecidia. 

 May 30, Sown on Sophia incisa; June 7, spermogonia; plant injured. 

 May 30, Sown on Erysimum aspcruni ; June 5, spermogonia ; June 14, 



aecidia. 

 May 30, Sown on Clcome spinosa; June 5, spermogonia; June 14, aecidia. 



We have here a demonstration of the remarkable fact, not 

 known for any other species of rust so far as I recall, that 

 Puccinia subnitens with teleutospores on Distichlis spicata has 

 aecidia growing with equal vigor upon species belonging to three 

 families of plants. The teleutospores for the above sowings 

 were all taken from the same collection, and from only a few 

 leaves of the grass, which precludes the possibility of a differenti- 

 ation in the teleutoform, or any division into races. The aecidium 

 is unusually well marked. Going over my herbarium and taking 

 out the forms which are identical with this species, beyond a 

 doubt, and adding to those already mentioned, we have the fol- 

 lowing hosts and distribution for the aecidium of this species. 



