130 



Mycologia 



also made on Ranunculus sceleratiis L. in the vicinity of the 

 rusted Alopecurus which doubtless belong here. 



Orton (Mycol. 4: 194. 1912) discusses the correlation between 

 certain species of Puccinia and Uromyces and gives a number of 

 examples of correlated species. Uromyces Alopecurus is clearly 

 correlated with Puccinia perplexans Plow, (now usually placed 

 with Puccinia Agropyri E. & E.) on Alopecurus pratensis L. 

 Cultures by the writer (Mycol. 4: 179. 1912) showed that 

 Puccinia perplexans has aecia on Ranunculus acris L. 



Puccinia angustata Peck 



Observations in the field clearly indicated that aecia on Mentha 

 canadensis L. were connected with a rust on Scirpus atrovirens 

 Muhl. Viable teliosporic material was collected at Brandon in 

 the spring and two pots of Mentha canadensis were inoculated on 

 May 28. Pycnia became evident on June 3 and aecia on June 10, 

 infection being very abundant. Dr. Arthur determined the rust 

 as Puccinia angustata Peck and pointed out that the aecia had 

 been confused with the aecia of Puccinia Menthae Pers. not- 

 withstanding they are much smaller and paler in color. Collec- 

 tions of aecia on Mentha canadensis belonging to this species 

 were made later in the season at Dauphin, Man., where they 

 were quite common. 



Dr. Arthur has shown many times that this rust also has aecia 

 on Lycopus (Bot. Gaz. 35: 15, 21. 1903. Jour. Mycol. 8: 53, 54. 

 1902, 11: 58. 1905; 12: 15. 1906; 14: 13. 1908. Mycol. i: 223. 

 1909; 2: 224. 1910; 4: 54. 1912; 7: 70. 1915). This experiment, 

 however, establishes for the first time connection with aecia on 

 Mentha. 



Puccinia Phragmitis (Schum.) Koern. 



This rust was collected on Phragmites communis Trin. at 

 Dauphin, Man. Wintered teliosporic material gave excellent 

 germination and inoculations were made on plants of Rumex. 

 Pycnia and aecia developed in abundance. The species of 

 Rumex used in the culture could not be determined but it prob- 

 ably was R. occidentalis Wats. Collections of aecia were made 



