J-p^i 



Am HUB : CULT1 RSS 01 [JREDINEAE in l| 223 



sown Mav i<> on Sam hue us canadensis and Ona^ra biennis, giv- 

 ing no infection on the former, but giving very abundant pyenia 



On the latter May 28, followed by aeei;i June & 



Four collections on the same host, made by Dr. J. F. Brenckle, 



at Kulm, \. 1).. were used for three successful sowings on 

 Onagra biennis, giving rise to pyenia in seven to twelve days, 

 followed by aecia in live to seven days more. Sowings on daunt 

 biennis and Cardans uiuiulatus gave no infection. 



A collection on Carex trichocarpa Muhl., made by Mr. F. D. 

 Kern at White House, St. Louis Co., Mo., after having been 

 sown on Sambucus canadensis with no infection, was sown April 

 21 on Gaura biennis, giving rise to pyenia April 30, and aecia 

 May io. 13 



2. Puccinia Caricis (Schum.) Schrot., on Carex aristata 

 R. Br., collected at Knlm, N. D., by Dr. J. F. Brenckle, was 

 sown April 6 on Urtica gracilis, giving rise to pyenia April 13 

 and aecia April 17, both in great abundance. A similar sow- 

 ing April 21 on Boehmeria cylindrica gave no infection. An- 

 other sowing May 4 on both hosts gave no infection on Boeh- 

 meria cylindrica, but produced the richest possible infection on 

 Urtica gracilis, showing pyenia May 9, and aecia May 15. lie- 

 side adding another species of Carex to the list of hosts supply- 

 ing culture material for this rust, 14 the results indicate that 

 Boehmeria is not an aecial host. 



It may be well to point out in this connection that the usual 

 citation of Rebentisch for this species of rust is erroneous. This 

 author in his Florae Neomarchicae, 1804, page 356, describes 

 Puccinia Caricis as a new species in the following words : " Sparsa 

 minutissima punctiformis, capsulis cylindraceis apicc utrinquc 

 attcnuatis. In foliis Caricis praeeocis J acq." Only the one host 

 species is named, neither the description nor the host tally with 

 those known to belong to the rust having its aecia on Urtica, as 

 may be seen by consulting Sydow's Monographia Uredinearum. 

 They, however, do agree well with those given by Sydow under 

 Puccinia sihatica, to which species Rebentisch's name should 

 doubtless be referred. 



13 For previous cultures see Bot. Gaz. 35: 13. 1903; Jour. Myc. 8: 55. 

 1902: ix : 58. 1905: 12: 15. 1906; 13: 195. 1907 ; and Mycol. 1: 233. 1909. 



14 For previous cultures see Bot. Gaz. 29: 270. 1900; 35: 16. 1903; Jour. 

 Myc. 8: 52. 1902; 12: 15. 1906; and 14: 14. 1908. 



