June, 1911.] 
The Known Polyporaceae of Ohio. 
373 
Schrenk, Hermann von. A Disease of the White Ash caused by 
Polyporus fraxinophilus. Bull. U. S. Dept. Agr. PI. Ind. 
32 : 9-20. pi. 2-5. Washington, D. C. The Government 
Printing Office. 1903. 
Sowerby, James. Colored Figures of English Fungi or Mush- 
rooms. pi. 1-440. London. Davis. 1797-1809. 
Spaulding, Perley. A Disease of Black Oaks caused by Poly- 
porus obtusus Berk. Rep. Mo. Bot. Gard. 16 : 109—1 1(3. 
pi. 13-16. St. Louis, Mo. 1905. 
