78 THE POLYPORACEAE OF WISCONSIN. 



Common on willow trunks about Madison. The largest part of the 

 specimen resupinately incrusts the trunks ; reflexed about 6 em. or 

 more ; 30 cm. or more broad, 7 to 9 mm. thick. Closely concentrically 

 sulcate, yellowish-brown becoming black on top, often covered with 

 moss. The pores are minute, short, stratose. The under surface is 

 usually uneven. The "silky pubescence" is scarcely noticeable. Most 

 of our specimens are convex below instead of concave. This may be 

 due to the fact that they grow on the under-side of leaning or fallen 

 trunks. Cystidia or spines are large and plentiful. 



Very much like F. ribis, its nearest ally. F. igniarius is thicker and 

 less resupinate, and F. salicinus is more pulvinate and less reflexed, 

 also darker in color. The species also grows on living Crataegus and 

 on lilac bushes. In these forms the pilei are small and scarcely re- 

 flexed. 



Syn. : Pyropolyporus concliatus (Pers.) Murrill pr. p.; 19, 30, p. 117. 



Fomes Ellisianus Anders. 



Pileus dimidiate, unguliform, 5 to 6 cm. thick, radiate-rugose and 

 zonate ; surface whitish and subpulverulent at first becoming yellowish 

 and glabrate, rimose, and finally of a dark weather-beaten wood color ; 

 margin subobtuse or rounded, in the plane and concave specimens fre- 

 quently with a distinct edge along its center ; pores stratose, sub-cylin- 

 drical, about three to a millimeter (including dissepiments). Margin 

 sub-acute, color at first white, finally creamy, or faintly yellowish, fra- 

 gile, easily bruised and rubbed off, leaving the surface ochraceous ; sur- 

 face concave becoming plane or convex in age. Pores extending nearly 

 through to the upper surface of the pileus, being covered above only 

 by a thin (2 to 4 mm.) corky, pale-ochraceous layer. Spores hyaline, 

 elliptical-globose or oblong, 5 to 6 by 4 to 5 microns. 



On SliepJierdia. 



The specimen referred to this species was determined doubtfully by 

 Bresadola. 



Fomes Everhartii Ellis & Gall. (Plate VI, fig. 26). (PI. VII, fig. 26). 



Pileus dimidiate, zonate-hoof-shaped, attached by a broad base, con- 

 vex above, subplane below but convex near the base and concave to- 

 ward the margin, crust opaque, then brownish black ; 9 to 12 cm. wide, 

 6 to 8 cm. long, margin subobtuse, finely tomentose and of a rhubarb- 

 brown color; pores rhubarb brown, equal, round, 0.11 to 0.12mm. in 



