Polyporaceae 



Boletus, yellow. Tubes adnate or decurrent, yellow, becoming reddish-brown, 

 the mouths large, angular. Stem short, irregular, narrowed below, 

 sprinkled with a yellow dust, yellowish tinged with red ; mycelium yel- 

 low. Spores oblong, minute, dingy-ochraceous. 



Var. muta bills. Flesh slightly changing to blue where wounded. 

 Stem reddish, yellow within, sometimes eccentric. Spores oblong- 

 elliptical, 7.5 9X3-4//.. 



Pileus 1.5-2.5 in. broad. Stem about I in. long, 3-6 lines thick. 



Roots of pine, Pinus palustris. The variety on stumps of Pinus 

 strobus. 



South Carolina, Ravenel; North Carolina, Curtis; New York, Peck. 



The species is remarkable for its habitat, which is lignicolous. The 

 New York variety grew on a stump of white pine. By its eccentric 

 stem it connects this genus with Boletinus, through Boletinus porosus. 

 According to the authors of this species it resembles Boletus variegatus. 

 Peck, Boleti of the U. S. 



B. Kavenel'ii B. and C. after Ravenel. Pileus convex or nearly 

 plane, slightly viscid when young or moist, covered with a sulphur-yel- 

 low powdery down, becoming naked and dull-red on the disk. Flesh 

 whitish. Tubes at first plane, adnate, pale-yellow, becoming yellowish- 

 brown or umber, dingy-greenish where bruised, the mouths large or 

 medium size, subrotund. Stem nearly equal, clothed and colored like 

 the young pileus, yellow within, with a slight evanescent webby or 

 tomentose ring. Spores ochraceous-brown, io-i2x5-6/M. 



Pileus 1-3 in. broad. Stem 1.5-4 in. long, 3-6 lines thick. 



Woods and copses. South Carolina, Ravenel; North Carolina, Curtis; 

 New York, Peck; New England, Frost. 



This is a very distinct and very beautiful species. Mr. Ravenel re- 

 marks in his notes that "this plant is not infested by larvae and preserves 

 more constant characters than any other Boletus with which I am ac- 

 quainted." The webby powdered filaments constitute a universal veil 

 which at first covers the whole plant and conceals the young tubes. As 

 the pileus expands this generally disappears from the disk, and, sep- 

 arating between the margin and the stem, a part adheres to each. The 

 flesh is sometimes stained with yellow. The tubes in some instances be- 

 come convex and slightly depressed around the stem. They are almost 

 white when young, and often exhibit brownish hues where wounded. 



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