THE POLYPORACEAE OF WISCONSIN. 39 



Trametes gibbosa (Pers.) Fr. (Plate I. fig. 8.) 



Pileus sessile, with gibbous base, 8 to 15 cm. broad, corky, elas- 

 tic, strigose, obsoletely zonate, whitish, becoming gray with age. Pores 

 linear, short, and narrow, usually straight, sometimes slightly sinuous. 

 Odorless. 



On trunks of various trees. 



Only a few specimens were found growing from the decayed side of 

 a living apple tree in Horicon, July, 1905. The largest specimen 

 measures about 8 cm. wide, 3 cm. long and from 2 to 3 cm. thick. 

 The color varies from whitish to grayish and pale brown. The upper 

 and lower surfaces are convex, the base being more or less decurrent. 

 The context is corky and has a wood color. 



The pores are large, narrow, unequal and more or less sinuous. The 

 young pores near the growing margin are small, but they become 

 larger and sinuous with age. 



Trametes Trogii Berkeley. 



Fuscous, subolivaceous ; pileus convex, subzonate, clothed with 

 bunches of rigid hairs ; margin acute, context white ; pores unequal, 

 eubangulate, dentate. 



This looks like T. Peckii, but is smaller, thinner, and lighter in 

 color, the context being white; the pores also are smaller and much 

 lighter in color, being almost white with a brownish tinge. They are 

 more decurrent than in T. Peckii. One specimen which was sent to 

 Professor C. H. Peck and identified by him was almost resupinate. 



This species is not so common as the preceding. Several specimens 

 were collected at Horicon on a cottonwood stump and another near Elk- 

 horn en a poplar stump. These specimens are much imbricated and 

 laterally confluent. The larger one measures 8 cm. in width and 3 to 

 4 cm. in length. The pileus is about 0.25 cm. thick and the pores vary 

 in length from 1 mm. to 1 cm. The diameter of the pores is about 0.3 

 to 0.4 mm. 



Trametes Peckii Kalchbrenner (Plate IV, fig. 15). 



Pileus suberose, dimidiate sessile, subdecurrent, hirsute, azonate, 

 ferruginous-fuscous, at length faded, margin acute; pores rather 

 large, rotund-angulate, concolorous with the pileus, becoming fuscous 

 with age ; context wood-colored. 



