Seymour.] 
184 
[Feb. 6, 
nicht beobacbtet. Oosporen unbekannt. Auf Blatten von j Kibes 
rubrum.” 
The Minnesota specimens show conidia 11.7-17/* by 13-21/^ ; 
oospores smooth or obscurely roughened, nearly filling the oogon- 
ium and closely invested by its thin, fuliginous wall, 25.5 to 35.7/*. 
The papilla of the conidium is seen with difficulty and appears more 
like an inward thickening of the wall than as an external promi- 
nence. On leaves of Ribes hirtellum. Detroit, Minn. 
Peronospora parasitica , (P.) Till., on Lepidium ; Jamestown, 
Dak. 
Peronospora Artliuri , Farl., on Oenothera biennis; Sand Point, 
Idaho. Oospores 15.6 to 39 /*. 
Since this species was first published as occurring in Iowa and 
Minnesota, it has been reported from Illinois, Wisconsin, Missouri, 
Kansas and New York. To these localities may be added Nan- 
tasket Beach, Mass., where it was found by the author, June 23, 
1885 and Grand Manan, Aug. 13, 1888, K. Miyabe. 
Peronospora Trifoliorum , DBy. On Astragalus; Bismarck, 
Dak., Livingston, Mont. 
Exs. : Fungi Europsei 3576. 
Cystopus Blitz, (Biv.) Lev. On Amarantus retrojlexus ; St. Paul 
and Brainerd, Minn., Jamestown, Dak. 
EHYSIPHE^i. 
DETERMINED BY F. S. EARLE. 
Sphcerotheca Humili , (DC.) Burrill., on Viola; Valley City, Dak. 
Sphcerotheca pannosa, (Wallr.) Lev., on Rosa; Valley City, Dak. 
Splmrotheca Mors-uvce , (S.) B. & C., on Ribes jloridum ; Fargo, 
Dak. 
Sphoerotheca Castagnei , Lev., on Erechtites hieracifolia and Nab- 
alus sp. Lake Minnetonka, Minn, j Hydrophyllum Virginicum ; 
Valley City, Dak. 
Erysiphe communis , (Wallr.) Schl., on Ranunculus Cymbalaria ; 
Livingston, Mont. Lathyi'usf; Lake Minnetonka, Minn. Oeno- 
thera biennis; Kootenai, Idaho. Oenothera sp. ; Bismarck, Dak. 
Erysiphe Cichoracearum , DC.,' on Aster , Valley City, Dak. 
Solidago and Cnicus; Bozeman, Mont. Helianthus ; Fargo, Dak. 
Erysiphe Linkii , Lev., on Artemisia dracunculoides ; Bozeman, 
Mont. Artemisia sp. ; Valley City, Dak. Also on A. Ludoviciana ; 
Helena, Mont., Sept., Kev. F. D. Kelsey. 
