June, 1911.] 
The Known Polyporaceae 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. 1886. 
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 several 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.) Murrill, Bull. Torr. Club 32 : 643. 
1906. 
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 : 645. 1906. 
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.) Murrill, Bull. Torr. Club 
32 : 469. 1906. 
Boletus nigromarginatus Schw. 
Known as Polyporus hirsutus (Wulf.) Fr. This is a very 
common species in this region. It is very 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 
