Feb. 1903 ] Uredineous Infection Experiments in 1902 
11 
Exp. 29. May 5. Aecidiospores sown on Washingtonia claytoni. 
— A few sori May 30. (Was this accidental?) 
Exp. 30. May 5. Aecidiospores sown on Washingtonia claytoni. 
— No infection. 
Exp. 31. May 5. Aecidiospores sown on Washingtonia claytoni. 
— No infection. 
Though apparent success attended some of the above experi¬ 
ments, none are considered satisfactory. While there is perhaps 
no doubt but that the Rust is the same on Chserophyllum and 
Osmorrhiza, American Uredinists have not to my knowledge 
made cultures for demonstration. 
The eight forms of spores so far named in the above list of 
experiments have yielded positive results (though doubtful in 
the case last cited above). All those that follow gave negative 
results; none of these need comment however except the first 
below, namely, that of Puccinia peckii (DeToni) Kellerm. 
PUCCINI A PECKII (DeTONl) KELLERM. FROM CAREX TRICHOCARPA. 
Exp. 34. 
Exp. 35. 
Exp. 36. 
Exp. 37. 
Ma}'- 8. Teleutospores sown on Lycopus sinuatus. 
— No infection. 
May 8. Teleutospores sown on Onagra biennis. 
— No infection. 
May 8. Teleutospores sown on Sambucus' canadensis. 
— No infection. 
May 8. Teleutospores sown on Senecio obovatus. 
— No infection. 
It is not explicable that failure should have resulted in case 
of Experiment 35. But the teleutospores used were not from the 
same locality as that for the material used in the third set of 
experiments (No. 26 being successful) ; the locality was a mile 
distant and the spores seemed to differ a little in size from the 
former material. Further study will be devoted to this case. 
The host was not vigorous which may possibly explain failure 
when spores of Aecidium sambuci were used. 
UROMYCES ANDROPOGONIS TRACY FROM ANDROPOGON VIRGINICUS. 
Exp. 61. May 31. Teleutospores sown on Cimicifuga racemosa. 
— No infection. 
Exp. 62. June 21. Teleutospores sown on Cimicifuga racemosa. 
— No infection (but the host plant not vigorous). 
PUCCINI EMACULATA SCHW. ON PANICUM CAPILLARE. 
Exp. 53. May 20. 
Exp. 54. May 20. 
Exp. 55. May 20. 
Exp. 56. May 20. 
Teleutospores sown on Lycopus sinuatus. 
— No infection. 
Teleutospores sown on Impatiens biflora. 
— No infection. 
Teleutospores sown on Boehmeria cylindrica. 
— No infection. 
Teleutospores sown on Ptelea trifoliata. 
— No infection. 
