428 MINNESOTA BOTANICAL STUDIES. 



7. Erysiphe galeopsidis DC. Flore Franc. 6 : 108. 1815. 

 On leaves of : 



S tacky s -palustrts L. : Lincoln, Aug., 1891, Sheldon 

 1572; Lincoln, Aug., 1891. Sheldon 1261. 



Seymour reports this species on Stachys -palustris at De- 

 troit, Minnesota. 



8. Erysiphe graminis DC. Flore Franc. 6 : 106. 1815. 

 On leaves of: 



Poa pratensis L. : Waseca, June, 1891, Taylor 228. Xo 

 perithecia found. Conidial stage ( Oidmm monthoides 

 Link) only is present. 



9. Uncinula salicis (DC.) WINT. Die Pilze i 2 : 40. 1887. 

 On leaves of : 



Salix sp. indet. : Winona, Sept., 1888, Holzinger ; Chi- 

 sago, Sept., 1891, Sheldon 4263 ; Traverse, Sept., 1892, 

 Sheldon 7172; Traverse, Sept., 1892, Sheldon 7013; 

 Chisago, Aug., 1892, Taylor 1634; Otter Tail, July, 



1892, Sheldon 3936; Hennepin, Oct., 1893, Sheldon 

 4093 ; McLeod, Aug., i. J. McElligott ; Traverse, Sept., 



1893, Sheldon 7069; Ramsey, Sept., 1898, Freeman 60. 

 Salix bebbiana SARG. : Chisago, Sept., 1891, Sheldon 4246. 

 Salix myrtilloides L. : Otter Tail, July, 1892, Sheldon 



3573^- 



Salix discolor MUHL. : Hennepin, Oct., 1893, Sheldon 

 4089. 



Populus deltoides MARSH. : Hennepin, July, 1889, Shel- 

 don ; Hennepin, Oct., 1889, MacMillan ; Wabasha, 

 Sept., 1893, Edna Porter. 



Populus grandidentata MICHX. : Hennepin, 1890, Mac- 

 Millan. 



Populus tremuloides MICHX. : Goodhue, Aug., 1893, An- 

 derson 707. 



Populus sp. indet. Hennepin, Oct., 1889, MacMillan. 



Seymour reports U. salicis on Salix sp. at Lake Minne- 

 tonka. 



10. Uncinula clintonii PECK, Rep. N. Y. St. Mus. 25 : 96. 



1873. Trans. Alb. Inst. 7: 216. 

 On leaves of : 



Tilia americana L. : Winona, Sept., 1888, Holzinger. 



