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. PL Ind. 

 32 : 9-20. pi. 2-5. Washington, D. C. The Government 

 Printing Office. 1903. 



SowERBY, James. Colored Figures of EngHsh 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 : 109-116. 

 pi. 13-16. St. Louis, Mo. 1905. 



