23o 



7(; 235 Mycologia 



other hosts from Maine and Indiana produced strong infection on 

 Solidago, and in one case a sparing infection also on Aster. In 

 the first culture report on the species, the close resemblance be- 

 tween this species and the parallel form under Puccinia, that we 

 are now calling P. extensicola, was pointed out, and in the second 

 report the evidence of well defined biological races was adduced. 

 Both of these points are further emphasized by the cultures here 

 reported. 



In this connection an error should be corrected in the report of 

 cultures for 1910. Quite anomalous results 26 were obtained in 

 that year by sowing material of Puccinia quadriporula Arth. from 

 Car ex Goodcnowii from the type locality, upon Aster paniculatus. 

 It was at that time pointed out that the resulting aecia were in- 

 distinguishable from those of P. Caricis- Aster is Arth. A careful 

 re-examination of the culture records has revealed the fact that 

 the sowing on April 26, 1910, 27 was immediately preceded by a 

 very successful sowing of Uromyces perigynius on another plant 

 of the same species of Aster. The inference is that the supposed 

 result from the spores of P. quadriporula in reality came from 

 stray spores of U. perigynius accidentally intermixed during the 

 operation, and do not represent a culture of P. quadriporula. 



Furthermore, a careful and extended morphological study of a 

 number of collections of P. quadriporula, made in different years 

 from the type locality and its vicinity, leave no doubt that the form 

 should be placed under P. Grossulariae, a Carex rust having aecia 

 on Ribes. The four-pored feature of the urediniospore, from 

 which the name is derived, is found to be no more marked than 

 in some other collections proven to be a part of that species. 



9. Uromyces Junci (Desm.)Tul. It was stated in the report 

 of cultures for 1910 28 that both Mr. Bethel and Dr. Brenckle held 

 the opinion that this species in some one of its forms would be 

 found to have aecia on Ambrosia psilostachya. Both gentlemen 

 provided material for a test the present season, which verified 

 their prediction, as the following record of cultures shows. The 

 telial host in each instance was J uncus balticus. 



26 Mycol. 4: 28. 1912. 



27 Mycol. 4: 21. 1912. 



28 Mycol. 4 : 23. 1912. 



