THE POLYPORACEAE OF WISCONSIN. 135 



The red pileus and the stipe spreading out into the pileus are dis- 

 tinctive features. Murrill makes this the same as B. glabellus Peck. 



Boletus bicolor Peck (Plate XX, fig. 69). 



Pileus convex, glabrous or merely pruinose-tomentose, dark red, firm, 

 becoming soft, paler and sometimes spotted or stained with yellow when 

 old, flesh yellow, not at all or but slightly and slowly changing to blue 

 where wounded; tubes nearly plane, adnate, bright yellow, becoming 

 ochraceous, slowly changing to blue where wounded, their mouths small, 

 angular or subrotund ; stem subequal, firm, solid, red, but generally yel- 

 low at the top ; spores pale, ochraceous-brown, 10 to 12.5 microns long, 

 4 to 5 microns broad. 



"Pileus 5 to 10 cm. broad; stem 2.5 to 8 cm. long, 8 to 12 mm. thick. 

 Woods and open places." Peck (21, 2, 8, p. 108) says further: "The 

 color of this plant is variable. In the typical form the pileus and stem 

 are dark red, approaching Indian red, but when old the color of the 

 pileus fades and is often intermingled with yellow. The surface some- 

 times becomes rimose-areolate. From the European B. Barlae this 

 species is separated by its solid stem, from B. versicolor by its small 

 tube mouths and its red stem." 



Mcllvaine (16, p. 425) says that it is one of the very best for eating. 



Numerous specimens were found at Devil's Lake, Lake Puckaway, 

 and Madison. Largest specimen 13 cm. in diameter; stipe 8 cm. long 

 and 2 cm. thick. Pilei red-incarnate to purple, very finely tomentose, 

 sometimes rimose-areolate, becoming yellowish toward the margin. 

 Pores adnate, depressed around the stem, small, yellow, turning green- 

 ish or bluish-green when wounded. Stipe thick, swollen toward the base 

 especially in joining specimens, sometimes minutely reticulated at the 

 top, colored like the pileus, yellow like the pores at the top, firm, solid. 

 Flesh yellow, sometimes with an incarnate tinge. All of the colors per- 

 sist in drying and the flesh shrinks very little so that it is of the most 

 easily preserved of the Boleti. 



Easily recognized by the beautiful red and yellow colors of the pileus 

 and stipe. 



Boletus alutaceus Morg. (Plate XXI, fig. 70). 



Pileus pulvinate, glabrous, alutaceous with a tinge of red, flesh white 

 inclining to reddish ; tubes semif ree, medium in size, unequal, angular, 

 greenish-yellow; stem nearly equal, striate, reticulate at the apex, col- 



