74 THE POLYPORACEAE OF WISCONSIN. 



growing on a hemlock stump near Gansevoort that were more depressed 

 than usual and were from 25 to 30 cm broad. A form growing on 

 wood of deciduous trees is less common and is destitute of the red and 

 yellow colors that are generally present in forms on wood of coniferous 

 trees. ' ' 



This species is very common in the northern half of the state and 

 very variable in form, color, size and host. It grows on pine, tamarack, 

 spruce, hemlock and birch. Localities: Gagen, Crandon, Hazelhurst, 

 Star Lake, Ladysmith, Shanagolden, Brule river (Overton) and the 

 Lake Superior Region. (Cheney.) One specimen was found on a 

 hickory stump at Madison by McKenna. 



Schweinitz (24, p. 157) describes a form as Fomes pini-canadensis : 

 "suberose, almost entirely resupinate, the margin of the pileus not 

 conspicuous, inseparable from the wood, hard and contracted, grayish- 

 brown, adpressed-fibrous, subzonate; ovate-orbicular in outline; mar- 

 gin acute, 10 — 15 cm. in diameter; tubes long, toward the margin 

 sterile, tawny-reddish, within grayish, pores minute, angular, reddish- 

 fleshcolor. On trunks of Pinus canadensis." 



This is in my opinion a resupinate form of F. ungulatus and is found 

 on the underside of pine logs on which the reflexed forms are also 

 present. A specimen was found near Hazelhurst which was 31 cm. 

 long, 12 cm. wide and 2.5 cm. thick, consisting of six strata which 

 averaged about 4 mm. in thickness. One specimen found at Montreal 

 by Cheney is 12 cm. long, 9 cm. wide and 8 cm. thick. In this re- 

 supinate form as well as in the type form, red colors are regularly 

 lacking from the surface of the pileus. 



Fomes ungulatus pinicola (Sw.) (Plate V, fig. 24 c and d). 



I include here less common ungulate forms with bright red margin. 

 Pileus at first pulvinate then ungulate, covered with a rind, glabrous, 

 unequal, tawny becoming blackish, margin of the adult cinnabar, with- 

 in hard, pallid ; pores minute, dissepiments obtuse, from pallid to ochra- 

 ceous. 



Specimens belonging to this form are most common on coniferous 

 trees, but are found also on birch. They are thick, less applanate than 

 F. marginatus, the zones more narrow, the tubes shorter and the sub- 

 stance harder than that of F. marginatus. The variety differs from 

 the type in the thicker pilei and in the bright red color of the margin. 

 The newest growth is yellowish and the next a narrow zone, is red ; the 

 rest of the pileus is grayish or blackish. The largest specimen, which 



