217 



Cap fawn-colored without, white within, stem much longer and branched. 



Fistiilina pallida 



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



spicuous red scales. Boletinus picttts 



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



Strobilomyces strobilaceus 



E. Stem annulate and glandular-dotted. Boletus luteus 



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



diameter. Boletus aniericanus 



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



diameter. Boletus granulatus 



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



Boletus JMorgam 



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



Flesh and tubes white or yellowish, unchanging when wounded, ^o/^/wj castatieus 



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



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



Flesh decidedly bitter. Boletus felleus 



Flesh not bitter. Boletus hidecisus 



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



K. Tubes yellow within, mouths reddish-orange. Boletus hiridus 



L. Stem entirely white or grayish-white. Boletus scaber 



Stem conspicuously bright yellow near the base. Boletus chromapes 



M. Pileus gi-ay, 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 fu in osipes 

 Tubes salmon colored, spores yellowish-brown. Boletus Vaitderbiltianus 



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 ininiato-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 



Ew York Botanical Garden. 



