Preliminarij List of Wisconsin Parasitic Fungi. 109 



12. Peronospora geranii Peck. 



On Gerayiiuvi maculatum L. Madison, Stougliton; Kirkland, Pam- 

 mel. 



13. Peronospora entospora (Roze & Cornu) (P. simjolex Peck). 



On Aster novae angliae L. and several unidentified species of Soli- 

 dago. Syene; Stoughton; La Crosse, Pammel. 



14. Peronospora pygmaea Unger. 



On leaves of Anemone nemorosa L., in May. Madison. 



15. Peronospora gangliformis (Berk.). 



On Lactuca sativa L. and L. canadensis L, Madison and Syene; 

 La Crosse, Pammel. 



16. Peronospora parasitica (Pers.). 



Common, on Capsella bursa pastoris Moench, Lepidium virginicum 

 L., Nasturtium armoracia Fr. and Brassica sp. Madison, Syene; 

 Baraboo, La Crosse, Pammel. 



17. Peronospora potentillae De Bary. 



On Potentilla norvegica L. Madison; La Crosse, Pammel. 



18. Peronospora arthuri Farlow. 



On Oenothera biennis L. Stoughton; La Crosse, Pammel. 



19. Peronospora viciae (Berk.). 



On Vicia faba L. and V. americana Muhl. La Crosse, Baraboo, 

 PammeL 



20. Peronospora effusa (Grev.). 



Common on Cheuopodium album L.,in summer. Madison; La Crosse, 

 Baraboo, Pammel. 



21. Peronospora alta Fckl. 



On Plantago major L. Madison; La Crosse, Pammel. i 



22. Peronospora calotheca DeBary. 



On Galium boreale L. and G. triflorum Michx. La Crosse, Pammel. 



23. Peronospora urticae (Lib.). 



On Urtica gracilis Ait . Kirkland, La Crosse, Pammel. 



24. Peronospora corydalis DeBary. 



On leaves of Dicentra cucullaria D C. Madison. 

 Locally abundant, covering the entire lower surface of the leaf with a 

 matted, gray felt. 



24a. Peronospora leptosperma DeBary. 



On Artemisia sp. La Crosse, PammeL 



