IOWA ACADEMY OF SCIENCE 
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On Alnus rugosa (Du Roi), K. Koch, Jones Co., Aug., 1895 (Macbride). 
On Carpinus caroliniana Walt., * Fayette, 1893 (Fink). 
On Ceanothus americanus L. Johnson Co. X (X). 
On Cornus candidissima Marsh. Muscatine, Oct. 21, 1893 (Bloom). 
On Corylus americana L. Ames, Sept. 2 and 14, 1878 (Bessey) ; Sept. 8, 
1894 (Stewart & Stewart); Decatur Co., Oct., 1904 (Anderson); * Fayette, 
1893 (Fink); Johnson Co., Sept. 29, 1886 (Macbride). 
On Euonymons autopurpurens Jacq. Fayette, Sept., 1893 (Fink). 
On Flowering pea. Johnson Co., Sept., 1889 (Bloom). 
On Juglans regia. Iowa City, Sept., 1888 (Macbride). 
On Lathyrus odoratus L. Ames, Oct., 1902 (Fawcett) ; Johnson Co., Aug., 
1892 (Macbride); Corydon, Nov. 6, 1900 (Stromsten). 
On Lathyrus palustris, L. Johnson Co., X (X). 
On Louicera sullivantii A. Gray. Decorah, Aug., 1879 (Holway) ; *Fayette, 
1893 (Fink); Fremont Co., Aug. 7, 1905 (Anderson). 
On Louicera sp. Ames, Oct. 9, 1892 (Carver) ; Forest City, X (X) ; Decatur 
Co., Oct., 1905 (Anderson). 
On Menispermun canadense L. *Holway in E. & E.. N. A. Pyrenomycetes. 
On Ostrya virginiana (Mill.), Willd., Decatur Co., Oct. 28, 1905 (Anderson). 
On Quercus macrocarpa Michx. Ames, Oct. 9, 1894 (Combs.) 
On Quercus robur. Ames, Oct., 1893 (Carver). 
On Quercus rubra L. Ames, Sept. 14, 1878 (Bessey) ; Oct. 20, 1882 (Osborn) ; 
Boone Co., Aug. 19, 1903 (Pammel & Buchanan) ; Decatur Co., Nov., 1904 
(Anderson); Iowa City, Sept. 9, 1900 (Shinnek); Oct. 7, 1898 (Bloom); 
Muscatine, Oct. 20, 1900 (X). 
On Quercus velutina Lam. Johnson Co., Oct., 1886 (Macbride). 
On Syringa vulgaris L. Ames, 1878 (Bessey) ; 1891 (Raymond) ; Oct. 9, 
1892 (Carver); Sept. 4, 1894 (Coombs); Sept. 10, 1894 (Stewart & Stew- 
art) ; July 22, 1898 (Carver) ; Oct. 14, 1901 (Lummis) ; Decatur Co., Nov. 
7, 1905 (Anderson) ; Fayette, Sept., 1893 (Fink) ; Iowa City, Oct. 12, 1886 
(Macbride) ; Jordan, July 30, 1903 (Buchanan). 
On Ulmus americana L. *Fayette, 1893 (Fink). 
On Vibernum lentago L. Decorah, Sept. 9, 1879 (Holway) ; *Fayette, 1893 
(Fink) ; Johnson Co., X (X). 
On Vida sp. Johnson Co., Aug. 12, 1884 (Macbride). 
This is a common and very variable species attacking a great 
variety of host plants. In the State University herbarium is a 
specimen on Platanus occidentalis collected in October, 1901, in 
Illinois opposite Muscatine. This species does not appear to be as 
destructive as some others but injures the host to some extent, often 
quite seriously. 
2. Microsphaera alni vaccinii (Schwein.) Salmon. 
Microsphaera elevata, Burr. Bessey, The Erysiphei; Hitchcock, Partial List 
Iowa Powdery Mildews. 
Generally epiphyllous; mycelium persistent or sometimes evanescent; peri- 
thecia variable in size, 70-145 micra in diameter, cells 10-20 micra wide; ap- 
