176 The Ohio Naturalist. [Vol. X, No. 7, 



Host plants in Ohio Herbarium: Carpinus caroliniana, Fairfield Co., 

 W. A. Kellennan; Catalpa (cult), Warren Co., Catalpa bignonoides, Fair- 

 field Co., W. A. Kellerman; Alnus rugosa, Licking Co., J. G. Sanders; 

 Magnolia acuminata, Franklin Co., J. H. Schaft'ner; Quercus rubra, Tole- 

 do, F. D. Kelsey; Fagus americana, Worthington, C. M. Weed; Castanea 

 sativa, var. americana, Knox Co., H. J. Detmers; Quercus sp., Fairfield 

 Co., W. A. Kellerman. 



Otherwise reported in Ohio: Phlox paniculata, Coluinbus, A. D. 

 Selb3^ 



Explanation of Plates IX and X. 



Figures 1 to 13, inclusive, were drawn at a magnification of 

 315 diameters, and cuts made at two-thirds reduction. These 

 figures, therefore, are shown at a magnification of 105 diameters. 



Figure 14 was drawn at a magnification of 210 diameters, and 

 cut made at two-thirds reduction. This figure, therefore, is 

 shown at a magnification of 70 diameters. 



Sphaerotheca huniuli (DC.) Burr. 

 Sphaerotheca phytoptophila Kell & Swingle. 

 Podosphaera oxyacanthae DeB. 

 Erysiphe polygoni DC. 

 Erysiphe eichoraceaiaini DC. 

 Uncinula clintoni Pk. 

 Uncinula necator (Schw.) Burr. 

 Uncinula salicis (DC.) Winter. 

 Podosphaera biuncinata C. & P. 

 Microsphaera russellii Clint. 

 Microsphaera difftisa C. & P. 

 Microsphaera grossulariae (Wallr.) Lev. 

 Microsphaera alni (Wallr.) Salmon. 

 Fig. 14. Phyllactinia corylea (Pars.) Karst. 



Date of Publication, May 9, 1910. 



