176 
The Ohio Naturalist. 
[Vol. X, No. 7, 
Host plants in Ohio Herbarium: Carpinus caroliniana, Fairfield Co., 
W. A. Ivellerman; 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. Schaffner; Quercus rubra, Tole- 
do, F. D. Kelsey; Fagus americana, Worthington, C. M. Weed; Castanea 
sativa, var. americana, Knox Co., H. J. Detmers; Quercus sp., F'airfield 
Co., W. A. Kellerman. 
Otherwise reported in Ohio: Phlox paniculata, Columbus, A. D. 
Selby. 
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, 
j 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. 
Fig. 1. Sphaerotheca humuli (DC.) Burr. 
Fig. 2. Sphaerotheca phytoptophila Kell & Swingle. 
Fig. 3. Podosphaera oxyacanthae DeB. 
Fig. 4. Erysiphe polygoni DC. 
Fig. 5. Erysiphe cichoracearum DC. 
Fig. 6. Uncinula clintoni Pk. 
Fig. 7. Uncinula necator (Schw.) Burr. 
Fig. 8. Uncinula salicis (DC.) Winter. 
Fig. 9. Podosphaera biuncinata C. & P. 
Fig. 10. Microsphaera russellii Clint. 
Fig. 11. Microsphaera diffusa C. & P. 
Fig. 12. Microsphaera grossulariae (Wallr.) Lev. 
Fig. 13. Microsphaera alni (Wallr.) Salmon. 
Fig. 14. Phyllactinia corylea (Pers.) Karst. 
Date of Publication, May 9, 1910. 
