180 



Mycologia 



that grew among the rusted Alopecurus. The first collection was 

 on June 28. 



The life history of this species has been worked out by Plow- 

 right and other European investigators, but this is the first ex- 

 periment with North American material, so far as the writer 

 is aware. 



PUCCINIA ALBIPERIDIA Arth. 



A few collections of Puccinia on Carex were sown successfully 

 on Rtbes as described below. All are placed under this species 

 for the present, until further study determines their true position. 



Puccinia on Carex intumescens Rudge was sown on Ribes pros- 

 tratimi L'Her on May 3 with abundant pycnia and aecia on May 

 12 and May 24 respectively. Another sowing on the same host 

 on May 25 showed pycnia on May 30 followed by aecia in a short 

 time. Two attempts were made to infect young thrifty plants 

 of Ribes oxyacanthoides L. but without success. A sowing on 

 Sambucus racemosa L. also failed. 



Puccinia on Carex crinita Lam. was sown on Ribes oxyacan- 

 thoides L. on May 7 followed by pycnia on May 15 and aecia on 

 the 24th, both in abundance. Another sowing on the same host on 

 June 16 was followed by pycnia on June 21 and aecia on July 2. 

 Infection was very abundant on the young stems and leaves. A 

 sowing on Ribes prostratum on May 6 showed pycnia on May 14 

 and aecia on May 24. Arthur (Jour. Myc. 14: 13. 1908) sowed 

 teliosporic material from Carex crinita successfully on Ribes 

 Cynosbati L. 



Puccinia on Carex debilis var. Rudgei (Carex tenuis Rudge) 

 was sown on Ribes prostratum on May 21 with pycnia on May 

 29, followed in a short time by many aecia. A collection from 

 this region was sown on Ribes Cynosbati the preceding year by 

 Arthur (Mycol. 4: 13. 1912). 



Puccinia on Carex arctata Boot, was sown on Ribes oxyacan- 

 thoides on June 2. Pycnia appeared abundantly on June 11. 

 Aecia appeared but they did not flourish and only a few matured. 

 Sowings were also tried on Sambucus racemosa and Aster acumi- 

 natus Michx. but without infection. 



