THE POLYPORACEAE OF WISCONSIN. 137 



Locality : Ladysmith. The largest specimen was 11 cm. in diameter; 

 the t'tipe was 14 cm. long and 1.5 cm. thick. In color the pileus was 

 pale drab, smooth to subtomentose. The margin was thin, explanate. 

 The tubes adnate-depressed, medium, roundish, at first pale, then brown- 

 ish gray. The stipe was smooth, grayish-brown, solid, tapering upward 

 The flesh was dull-whitish. The tubes change to faint-bluish when 

 bruised and later become brownish. The color change was not as marked 

 as one might expect from the description. 



The species is recognized by its dull, pale color, rather long stem and 

 tubes changing to blue when wounded. 



J. Subtomentosi. Dry, tomentosc when young, sometimes becoming 



glabrate. Tubes adnate. 



Boletus subtomentosus Linn. (Plate XXII, fig. 74). 



Pileus convex or nearly plane, soft, dry, villose-tomentose, suboliva- 

 ceous, concolorous beneath the cuticle, often rimose-areolate, flesh white 

 or pallid ; tubes adnate or somewhat depressed around the stem, yellow, 

 their mouths large, angular; stem stout, somewhat ribbed-sulcate, sca- 

 brous or scurfy with minute dots ; spores 10 to 12.5 microns in length, 

 4 to 5 microns broad. 



Pileus 2.5 to 10 cm. broad ; stem 2.5 to 7 cm. long, 4 to 9 mm. thick. 



Peck (21, 2, 8, p. 117) also adds the following observations: "The 

 pileus is usually olivaceous or yellowish-brown, but it may be reddish- 

 brown, or tawny-red. When it cracks, the chinks become yellow. The 

 stem is often attenuated downwards, but it is not always ribbed or sul- 

 cate. In one form it is marked with slight anastomosing lines which 

 form broad reticulations as in B. lanatus Rost. In another form which 

 grows on very rotten wood or stumps, the pileus is dark-brown. These 

 may be distinct species. According to Johnson, wounds of the flesh 

 sometimes become reddish and according to Palmer, ' the flesh tubes and 

 stem change to blue wherever bruised or cut, ' but I have not been able 

 to verify these statements. ' ' 



This species is quite common in some regions. Localities : Algoma, 

 Milwaukee, Madison, Afton, Crandon, Horicon, Hazelhurst and Star 

 Lake. Near Crandon several specimens were found on a very rotten log. 

 These were dark-brown and the pores were of a brighter yellow than 

 those of the other specimens. The specimens found at Horicon were 

 thick-pulvinate and the tubes distinctly change to bluish-green when 

 bruised; this color change was also noticed in the Crandon specimens. 

 In the other specimens no color change was noticed. The largest speci- 



