NATURAL HISTORY SURVEY 109 



Fomes igniarius L. 



Pileus at first tuberculose-globose with a thin light covering, 

 appressed-flocculose, canescent, then ungulate, blackening, the 

 margin rounded, context zonate, ferruginous. 



Pores very small, convex, stratose, cinnamon, at maturity 

 white-stuffed, at first canescent. 



Mycelium and spores white. (Berkeley.) 



Glen Ellyn, Winfield, Riverside, etc., usually on species of 

 Quercus. Skokie marsh, on dead Populus tremuloides. Pepoon. 



Old plants often present the appearance of several thin 

 (.5 to 1 cm.) rounded, superimposed layers, reminding one of a 

 plate of buckwheat cakes. The weathered portions of the plant 

 are vertically and transversely checked, but not deeply rimose. 

 A form wholly resupinate has been found on the under side of 

 trunks at Riverside and Glencoe. This must be carefully dis- 

 tinguished from resupinate forms of F. fulvus and P. gilvus. 



A form differing widely from the above, and formerly referred 

 by our collectors to F. rimosus Berk., may belong here. It is 

 frequent on dead trunks of various trees, particularly on Quercus. 

 The young sporophores are in the form of discoid lumps. The 

 surface of the growing plant is covered with a cinnamon velvety 

 pruina which disappears with age. The border is very broadly 

 rounded (4 to 6 cm. thick). Old plants show one or two deep 

 concentric sulcations. The weathered portions are of a dull 

 black color, deeply and irregularly cracked. The pores are 

 3 to 8 mm. long, about 1-5 mm. broad, not stuffed; spores glo- 

 bose, ferruginous, 3 to 3^ ft. It agrees in many particulars with 

 F. badius Berk, from Arctic Xorth America, but the pores of that 

 species are said to be 1-3 mm. in diameter, and the pileus "crusta- 

 ceous-laccate." 



Fomes Everhartii Ell. & Gall. 



Pileus dimidiate, unguliform, zonate, convex above, nearly 

 plane below; margin subobtuse and clothed with a rich rhubarb- 

 yellow thin tomentum, at length subglabrous. 



Pores rhubarb-yellow, equal, round, substratose, armed with 

 abundant stout spines, 15 to 25 x 6 to 10 ft.; spores ferruginous, 

 globose, 3 to 3^ u., or ovate-globose, 3^ to 4 x 3 to 3^ ft. Pileus 

 6 to 12 cm. wide, 6 to 8 cm. long, cork-leathery, rhubarb-yellow 

 within and repeatedly zonate. 



A single specimen collected in woods (near Winfield?), by 

 Mr. Harry Ashley. It is much larger than the dimensions given 

 above, being 24 cm. broad, 12 cm. long, 10 cm. thick at the base. 

 It agrees perfectly with the specimens distributed in N. A. F. 

 as Mucronoporus Everhartii. On dead standing trunks of Quercus. 

 Woods near Bartlett. 



Fomes fraxinophilus Pk. 



Pileus sessile, thick, corky, subtriquetrous, narrow, somewhat 

 decurrent behind, the first year whitish, with a minute whitish 



