June, 1911.] The Known Polyporaeeae of Ohio. 355 



with dark concentric rings. The pileus develops from the 

 under side of this cup, which often entirely disappears. 

 The pileus is fan-shaped and generally narrowly attached. 

 The species is easily recognized by the sterile, concen- 

 trically zoned, cup shaped structure. Very common on 

 fallen elm branches, from September until winter. 



9. Coriolus versicolor (L.) Quel. Ench. Fung. 175. 1SS6. 

 Boletus versicolor L. 



Commonly known as Polyporus versicolor (L.) Fr. The 

 most common and variable of all the Polypori of this region. 

 The writers' specimens include seA^eral collections from dif- 

 ferent localities and no two of them are alike in their com- 

 binations of colored zones. It is frequently found encircling 

 small twigs in a spiral manner. It may be found from 

 July until December on all kinds of deciduous wood, in the 

 woods, fields, yards, or along the roadsides. It is frequently 

 found on the lilac and is said to cause a serious disease of 

 that plant. Readily recognized by its thin, coriaceous, 

 multizonate, pileus. 



Illustrations: Hard, p. 143, f. 343; Sow. Eng. Fungi, pi. 229 



10. Coriolus hirsutulus (Schw.) IMurrill, BuH. Torr. Club 32 : 643. 



1900. 

 Polyporus hirsutulus Schw. 



This plant is closely related to C. versicolor and may be 

 but a variety of that species. On dead deciduous wood. 

 Common. 



11. Coriolus pubescens (Schum.) Murrill, Bull. Torr. Club 



32 : 045. 1900. 

 Boletus pubescens Schum. 



Commonly known as Polyporus pubescens (Schum.) Fr. 

 The entire plant is white or yellowish and the pileus is 

 pubescent but becomes glabrous with age. The hymenium 

 has a silky luster and the walls of the pores are sometimes 

 lacerated. The writer has seen rotten beech logs entirely 

 covered with this fungus. Found from September until 

 winter, on dead wood, especially beech. 



Illustration: Hard, p. 410. f. 339. 



12. Coriolus nigromarginatus (Schw.) Alurrill, Bull. Torr. Club 



32 : 409. 190(i. 

 Boletus nigromarginatus Schw. 



Known as Polyporus hirsutus (Wulf.) Fr. This is a very 

 common species in this region. It is ver}' variable, espe- 

 cially in the character of the pileus. The typical form is 

 rather thick, hirsute, and concentrically zoned, and has a 

 dark colored margin. The hymenium varies in color from 



