82 TEE POLYPORACEAE OF WISCONSIN. 



Fomes rimosus Berk. 



Pileus woody, very hard, pulvinate, ungulate from the annual strata, 

 at length rimose, subumbrinous, deeply sulcate, the growth of the year 

 velvety-pruinate, cinnamon ; context very hard, fibrous ; pores very 

 long, thin, fulvous-ferruginous with the mouth indistinct, rhubarb 

 color. 



Not common. A few specimens were found on oak and on locust near 

 Madison. The largest is about 12 cm. wide, 8 cm. long, and 3 to 4 cm. 

 thick. Most of the specimens are very rough and uneven. The speci- 

 mens are very hard but not "deeply" sulcate, although some have two 

 and three strata of pores. The color is very much like that of Polyporus 

 gilvus — perhaps a little darker — and it becomes black with age. the 

 surface cracking in every direction. The plant is convex on both sides 

 with a somewhat acute margin. 



The tubes are long, 1 cm. or more, and indistinctly stratified. The 

 pores are very minute, roundish, equal ; the mouth indistinct. 



Young and unstratified specimens can hardly be distinguished from 

 Polyporus gilvus, but the older are easily recognized by the checked sur- 

 face, the stratified tubes and usually the deep sulcations. 



Fomes fomentarius (L.) Fries (Plate IX, fig. 30). 



Pileus ungulate-pulvinate, thick, glabrous, remotely concentrically 

 sulcate, from sooty to canescent, within soft floccose, fulvous ; the crust 

 thick, hard, persistent; margin and pores prolonged, the latter min- 

 ute, distinctly stratose, at first glaucous-pruinose, then rusty. 



Common westward and northward. Localities : Monroe County, on 

 dead birch; Madaline Island (Allen) ; Lake Superior (Cheney) ; and 

 in Dane, Oneida, Vilas, Ashland, Forest and Clark Counties. 



Largest specimen is 9 cm. broad, 6 cm. long and 9 em. thick, being 

 strongly hoof -shaped. Another flatter type is 9 cm. wide, 9 cm. long 

 and 2 cm. thick. The pileus in all of the specimens is comparatively 

 thin. In the largest specimen the pileus is 2 cm. thick near the base, 

 near the margin it is only 0.5 cm., the rind is about 1 mm. thick, and the 

 tubes vary from 3 to 6 cm. in length. In the flatter specimens the 

 pileus averages 0.75 cm. thick and the tubes vary in length from 2 mm. 

 near the margin to 1.5 cm. near the base. The tubes are indistinctly 

 stratose and somewhat white-stuffed. They have about the same color 

 as the pileus — a ferruginous brown, the mouths are paler and duller. 

 The rind is dark brown in substance with a gray surface, concentrically 



