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Cap fawn-colored witliout, white within, stem much longer and branched. 



Fislulitta pallida 



B. Tubes large, arranged in radiating rows ; pileus and stem adorned with con- 



spicuous red scales. Boletinus pictus 



C. Pileus blackish and shaggy ; tlesh white, changing to reddish when bruised. 



Slrobilomyces strphilacetis 



E. Stem annulate and glandular-dolted. Bolelus lutetis 



F. Pileus yellow, often streaked with bright red ; stem slender, 8 mm. or less in 



diameter. Boletus americnnus 



Pileus brown when moist, yellowish on drying ; stem stouter, over 8 mm. in 



diameter. Boletus gramtlatus 



G. Stem shaggy and lacerate, with deep reticulated furrows ; cap viscid and glabrous. 



Boletus Morgani 



H. Flesh and tubes becoming deep blue when wounded. Boletus cyanescens 



PMesh and tubes white or yellowish, unchanging when wounded. i9o/i'/?« castaneus 



I. Stem and pileus covered with a conspicuous yellow powder. Boletus Knvenelii 



J. Pileus large, stem i cm. or more thick. 



Flesh decidedly bitter. Boletus felleus 



Plesh not bitter. Boletus indecisus 



Pileus small, stem about 5 mm. thick. Boletus gracilis 



K. Tubes yellow within, mouths reddish orange. Boletus luridus 



L. Stem entirely white or grayish white. Boletus scaber 



Stem conspicuously bright yellow near the base. Boletus chrotnapes 



M. Pileus gray, tubes white. Boletus griseus 



Pileus yellow or brown, tubes yellow. Boletus retipes 



Pileus red. 



Stem bright lemon-yellow throughout. Boletus speciosus 



Stem red below, yellow above. Boletus Peckii 



N. Tubes white, afterwards colored by the ochraceous brown spores. 



Boletus funiosipes 

 Tubes salmon colored, spores yellowish brown. Boletus Vanderbiltianus 



Tubes yellow or greenish yellow. 



Tubes changing to blue when wounded. 



Pileus subtomentose. , Boletus chrysenteron 



Pileus glabrous. 



Pileus bright red to olivaceous, the entire plant quickly turning blue 



at any point where touched. Boletus miniato-olivaceus 



Pileus dark red, not sensitive, changing color slowly or not at all 



when bruised. Boletus bicolor 



Tubes not changing to blue when wounded. 



Pileus subtomentose, tubes becoming greenish yellow. 



Boletus subtomentosus 



Pileus glabrous, tubes remaining a beautiful golden yellow even after 



long drying. Boletus auriporus 



0. Stem and pileus bright golden yellow ; plant small. Boletus aurijlammeus 



Stem brownish lilac or chocolate-brown. 



Stem reticulated. Boletus separans 



Stem furfuraceous, not reticulated. Boletus eximius 



