198 



Arthur: Cultures of Uredineae in 1910 29 



May 6. The result shows that the species is eugyrinious and 

 antoecious. 



4. Uromyces acuminatus Arth., on Spartina Michauxiana 

 A. S. Hitch, (usually listed as S. cynosuroides), collected by Dr. 

 J. F. Brenckle at Kulm, N. D., was sown April 28 on Steironema 

 ciliatum and Polemonium reptans, with abundant infection on the 

 latter only, showing pyenia May 9, and aecia May 14. 



A similar collection made by Mr. E. Bethel in the foothills of 

 Colorado was sown May 12, on Steironema ciliatum, Hydrophyl- 

 lum capitat urn, Phlox divaricata, and Polemonium reptans, with 

 very abundant infection only on the last, showing pyenia May 20, 

 and aecia May 26. Another collection made at Fair Oaks, Ind.. 

 by Messrs. F. D. Kern and T. Billings, was sown one week later 

 on the same hosts, but gave no infection, doubtless due to the 

 lateness of the season. 



These results bear out the field observations of Professor Guy 

 West Wilson, as stated in the report for 1909. 54 The aecial stage 

 is known in literature as Aecidium Polemonii Peck, and occurs 

 on species of Phlox as well as on Polemonium. 



5. Coleosporium Vernoniae B. & C. Freshly gathered leaves 

 of Pinus taeda L., bearing Peridermium carneum Bosc, gathered 

 by Mr. O. F. Burger at Gainesville, Fla., May 18, 1910, were 

 suspended on May 21, over potted plants of Veronia crinita, 

 Elephantopus carolinianus and Lacinaria scariosa. Contrary to 

 expectation uredinia began to show in abundance June 6 on the 

 Veronia only. Numerous telia began to mature by August 16. 



6. Melampsora albertensis Arth., on Populus tremuloides 

 Michx., was sent by Mr. E. Bethel on three different dates, col- 

 lected at different places in the foothills of Colorado, and all 

 showing telia in resting condition. The first collection was sown 

 April 20, on Larix laricina and Pseudotsuga mucronata, giving 

 infection on the latter only, showing an abundance of pyenia May 

 2, and an equal abundance of aecia May 9. The second collection 

 (from Plainview, Colo.), was also sown April 20, on the same 

 two hosts, but without results. Later on. May 18, duplicate sow- 

 ings were made. This time the Larix remained free, and the 

 Pseudotsuga after a long interval was found to have been infected, 



M See Mycol. 2: 222. 1910. 



