SPECIES OF VISCID BOLETI. 59 



7 Pileus yellow. 8. 



7 Pileus not clear yellow. B. granulatus. 



8 Stem rhubarb color. B. punctipes. 



8 Stem yellow, 4 lines or more thick. B. subaureus. 



8 Stem generally yellow, less than 4 lines thick. B. Americanus. 



9 Pileus bay-brown or chestnut color. 10. 



9 Pileus some other color. B. piperatus. 



10 Pileus very glutinous, stem very short. B. brevipes. 



10 Pileus merely viscid when moist, stem longer. B. badius. 



Boletus Kavenelii B. & C. 



Ravenel's Boletus. 



Pileus convex or nearly plane, slightly viscid when young or moist, 

 at first covered with a sulphur-yellow pulverulent tomentum, the disk 

 at length naked, dull-red, flesh whitish, sometimes with yellowish 

 strains ; tubes at first plane, adnate, pale-yellow, at length yellowish- 

 brown or umber, sometimes becoming convex and slightly depressed 

 around the stem, dingy-greenish when bruised, medium size, subro- 

 tund ; stem nearly equal, clothed and colored like the young pileus, 

 yellow within, with a slight somewhat evanescent tomentose annulus ; 

 spores ochraceous-brown, .0004 to .0005 in. long, .0002 to .00025 

 broad. 



Plant solitary, rarely csespitose, pileus 1 to 3 in. broad, stem 1.5 to 

 4 in. long, 3 to 6 lines thick. 



Woods and copses. Rensselaer, Saratoga and Fulton counties. 



This is a very distinct and beautiful species. Mr. Ravenel remarks 

 in his notes that " this plant is not infested by larva?, and preserves 

 more constant characters than any other Boletus with which I am 

 acquainted." The webby powdered filaments constitute a universal 

 veil, which at first covers the whole plant and conceals the young 

 tubes. As the pileus expands, the veil generally disappears from the 

 disk and ruptures between the margin and the stem, a part adhering 

 to each. In consequence of the peculiar veil and the slight viscidity 

 of the pileus the species does not harmonize well with the associated 

 species, and but for the slight annulus it might as well be placed near 

 B. piperatus. The annulus is sometimes stained by the spores. 

 These, when caught on white paper, at first appear to have a slight 

 greenish tint. 



Boletus spectatoilis Pk. 

 Showy Boletus. 



Pileus broadly convex, at first covered with a red tomentum, then 

 squamose, viscid when moist, red, the tomentose scales becoming 

 grayish-red, brownish or yellowish, flesh whitish or pale-yellow ; tubes 



