Polyporaceee 



Boletus. 3. Stem scabrous or punctate-squamulose B. scaber 



3 . Stem even 4 



4. Pileus white or whitish B. albellus 



4. Pileus dark-brown B. sordidus 



Peck, Boleti of the U. S. 



B. alboa'ter Schw. black and white. Pileus convex, subtomentose- 

 velvety, black. Tubes free, their mouths rather small, white. Stem 

 black. 



PileilS 3 in. broad. Stem 2 in. long. 



Moist woods. Frequent. North Carolina and Pennsylvania, Schwei- 

 nits. 



In Epicrisis, p. 424, Fries adds to the description here quoted, that 

 the stem is flocculose-veiled. He subjoins to this as a subspecies, 

 Boletus floccosus Schw.; but in Syn. N. A. Fung., Schweinitz makes 

 this a synonym of Boletus floccopus. The species does not appear to 

 have been recognized by recent collectors, which seems strange unless 

 there is some error concerning it. Can it be a black variety of Boletus 

 scaber? Peck, Boleti of the U. S. 



Mt. Gretna, Pa. Gravelly woods. Mcllvaine. 



Cap 1)2-4 m - across, convex, slightly depressed, margin involute 

 when young, black, densely velvety in youth and age beautifully so. 

 Flesh firm, thick, solid, white changing to grayish. Tubes white, 

 stuffed, sometimes blackish when young, excepting a grayish-white 

 circle around stem, becoming yellowish-white when matured, rotund, 

 minute, up to % in. long, plane when young; when caps expand tubes 

 draw away from stem leaving a deep white depression. This drawing 

 away apparently elongates many dissepiments, creating a gill-like effect, 

 decurrent upon stem. Stem 2-3 in. long, swollen toward base when 

 young, equal, expanding into cap and tapering to a point at base; K 

 i in. thick, slightly compressible, hard, sooty-black, velvety near base, 

 satiny and glossy upward, has the appearance of having been blackened 

 with burnt cork, usually with narrow white band next to the tubes, no 

 trace of veil, composed of rather hard waved fibers, white when split, 

 but changing to sooty black toward base, lighter upward. 

 Smell like common mushroom ; taste nutty. 



Gregarious in sandy-conglomerate soil in mixed woods, among moss 

 leaves. Mt. Gretna, Pa. 



460 



