Freeman: MINNESOTA UREDINE^E. 547 



On Carcx castanca WAHL. : Lake, (III) Je. 1893, Shel- 

 don 4822. 



Carex utriculata BOOTT : Houston, (III) My. 1900, 

 Lyon 537. 



Carex sp. indet. : , (III) 1893, Sheldon 7135, 7368 

 and 7122; Hennepin, (III) O. 1898, Freeman; Henne- 

 pin, (III) S. 1900, Freeman 786^. 



Urtica gracilis AIT. : Ramsey, (I) My. 1899, Freeman 

 322; Waseca, (I) Je. 1891, Sheldon 206 and Taylor 

 302. 



Urtica sp. indet. : Hennepin, (I) 1893, Sheldon 5968 and 



59 6 7- 



13. P. phragmitis (SCHUM.) KORN. Hedw. 15: 179. 1876. 

 In Europe it has been demonstrated by several investigators 



that the aecidium on various species of Rumex belongs to P. 

 phragm i/is. According to the recent culture experiments of 

 Arthur (1. c.) aecidia were easily obtained upon Rumex crtspus 

 and Rumex obtusifolius. According to the same author no au- 

 thentic and undoubted record of the collection of ^Ecidntm 

 rubcllum GMEL. has been reported upon American species of 

 Rumex. A Minnesota specimen of Riimex britannica L. was 

 collected in 1899 (Freeman 471) upon which several groups of 

 aecidia were found. Upon comparison with sEcidmm rubellum 

 on R. hydrolapathum * the two specimens were found to agree 

 perfectly in all morphological characters. 



The spots are circular and usually of a reddish color, not 

 swollen. Pseudoperidia on lower surface of the leaf somewhat 

 crowded, leaving usually a free central area, flat, cup-shaped with 

 revolute lacerate margin. Spores 17 23 // x n 17 /^. It seems 

 very probable therefore that this ascidium on Rumex britannica 

 belongs to P. phragmitis. Arthur's explanation that the aecid- 

 ium on Rumex has up to this time been overlooked is therefore 

 probably correct. 



On Rumex britannica L. : Ramsey, (I) Je. 1899, Freeman 

 471. 



Phraomites -phragmites (L.) KARST : ?(IH) T 893, Shel- 

 don 7119. 



14. P. rhamni (P.) WETTST. Verh. Zool.-Bot. Ges. Wien. 35: 



545. 1885. (P. coronata CDA.) 



* Krieger Fung. Sax. no. 853. 



