Webber — Catalogue of the Flora of Nebraska. 11 
14. PERONOSPORACEZ®. 
29. PERONOSPORA Corda. 
33. P. OXYBAPHI Ell. & Kell On leaves and young shoots of Oxybaphus 
nyctagineus, causing much damage to the host. Elmwood, Ash- 
land. June and July (Williams). 
30. PLASMOPARA Schroet. 
34. P. HALsTEDIT (Farlow) Berl. and De Toni. On leaves of Sun- 
flower (Helianthus annuus), Lincoln, Oct. (Webber). Great rag- 
weed (Ambrosia trifida), Wabash, Aug. (Williams). 
31. SCLEROSPORA Schroet. 
35. S. GRAMINICOLA (Sacc.) Schroet. (Peronospora graminicola Sacc. > 
On Green and Yellow fox-tail (Setaria viridis and S. glauca), Ash- 
land, Weeping Water (Williams). Lincoln (Besse ey). 
32. CYSTOPUS Lev. 
36. C, IPOMOEH-PANDURANE—Sacc.—Farlow. On leaves and petioles 
of Morning Glory (Ipomea Sp.) Richardson Co., Aug. (Webber) ; 
Ashland (Williams). Very destructive, variously twisting and 
distorting the leaves and petioles, finally causing them to drop 
off, : 
CARPOPHYTA. 
15. COLEOCHAETACEZ. 
33. COLEOCHAETE Breb. 
37. C. IRREGULARIS Pringsh. Minden. In material collected by Dr. 
Hapeman (Bessey). 
38. C. ORBICULARIS Pringsh. Minden. In material collected by Dr. 
Hapeman (Bessey). 
16. ERYSIPHE. 
34. ERYSIPHE Hedw. 
39. E. GRAMINIS DC. Conidia stage (Oidium monilioides Link.) On 
’ leaves of Wild Rye (Elymus canadensis), Weeping Water (Wil- 
liams). 
The Oidinm is the only stage frequently found here. I have 
frequently observed this at Lincoln on various grasses, but have 
never found the perithecia (Webber). 
17. SPH. ERIACER. 
35. CHETOMIUM Kunze. 
40. C. cHarrarum Ehrenb, On —_ broom. 
36. PHYSALOSPORA Niessl. ae 
41. P. ee cate (Peck) Sace. On leaves of Astragalus drammonait. 
ont, Dawes Co., July. Quite destructive (Webber). coe 
Liscoln eee)» 
