32 



4. Microsphaera diflfusa C. & P. on Meibomia canescens 



(L.) Kuntze, M. dillenii (Darlingt) Kuntze. 



5. Sphaerotheca castagnei Lev. Bidens frnondosa, L. 



Oct. 6; on Prenanthes alba, L., Oct. 6; Taraxa- 

 cum officinale, Weber. 



6. Sphaerotheca humuli (D.C.) Burrill on Rubus odor- 



atus, L. 



7. Uncinula circinata C. & P. on Acer rubrum, L., 



Oct. 26; Acer saccharinum, L., Sept. 29; Acer 

 saccharum, Marsh, Oct. 17. 



8. Uncinula salicis (D.C.) Winter on Salix cordata, 



Muhl, Aug. 17, Sept. 29, Oct. 22. 



9. Uncinula necator (Schrn.) Burr, Vitis quinquefolia, 



(L.), Lam., Sept. 27. 



LIST OF "WHITE MILDEWS" (ERYSPHEAE, 



LEV.), EITHER POT FOUND IN CUYAHOGA 



CO.. OR NOT ON THE BELOW NAMED 



HOST-PLANTS. BUT COLLECTED IN 



ERIE (a), OR MEDINA (b) CO. 



BY EDO CLAASSEN. 



(a) Podosphaera ox3'acanth^e (D.C.) DeBary, Prunus, 



Aug. 25. 



Microsphaera symphoricarpi, Howe Symphori- 

 carpus pauci florus, Robbins, Aug. 25. 

 Uncinula salicis (D. C.) Winter, Salix glauco- 

 phylla, B., Aug. 25; Populus monilifera. Ait, 

 Aug. 25; Populus tremuloides, Michx., 

 Aug. 25. 



(b) Sphaerotheca humuli, Geum canadense, Jacq., 



July 11. 



