200 



Mycologia 



it is apparently correlated with Uromyces pedatatus (Schw.) 

 Sheldon. It has urediniospores which measure 1^-20 by 19-23^, 

 with walls about 3 /x thick, usually slightly thicker above, very 

 finely and closely verrucose-echinulate, and have 4 or sometimes 3 

 equatorial pores. The urediniospores of Uromyces pedatatus pos- 

 sess no differential characters from those of Puccinia Ellisiana 

 and have the same number and arrangement of pores. Thetelio- 

 spores of the two have the same general shape and wall thick- 

 ness and so we venture to predict that Dr. Brenckle's observations 

 are entirely correct and that P. Ellisiana has Viola for its aecial 

 host.^^ The telial hosts of Uromyces pedatatus are restricted so 

 far to Andropogon glomeratus (Walt.) BSP. and A. virginicus 

 L. with a range extending from the Atlantic coast to Arkansas 

 and southward, while the telial hosts of Puccinia Ellisiana include 

 in addition to those of U. pedatatus, Andropogon furcatus Muhl. 

 and A. scoparius Michx. with practically the same southern range 

 but extending further north into North Dakota and west to Colo- 

 rado. Here we see the greater adaptability of the two-celled 

 form in a wider range of hosts and distribution. 



•In 1901, Dr. Arthur-* connected a rust on Carex puhescens 

 with an aecium on Rihes Cynosbati L. which possessed in culture 

 a white or very pale peridium in contrast to the usual orange- 

 colored aecial forms on various species of currants and gooseber- 

 ries. He named the rust Puccinia albiperidia. In 1910 it was 

 found that the original telial host as well as several other telial 

 hosts represented in the herbarium, part having been reported in 

 cultures,^^ possessed urediniospores with the marked morpholog- 

 ical character of one basal pore, and it was decided that P. albipe- 

 ridia was a good morphological species having its aecia on Ribes 

 spp. Very recently, however, it has been found that in the type 

 material and in every case where the species has been cultured on 

 Ribes urediniospores in more or less abundance could be found 

 which were morphologically identical with the urediniospores of 

 the common gooseberry-currant rust of Europe and America. 



'^^ Since the writing of this paper it has been communicated to the writer 

 through Dr. F. D. Kern that Mr. W. H. Long reports having cultured a Puc- 

 cinia from Andropogon upon Viola. Doubtless this was Puccinia Ellisiana. 



^Jour. Myc. 8: 53. 1902. 



^'Jour. Myc. 10: 11. 1904; Mycologia 4: 13. 1912. 



