American Boletes 



Tubes stuffed when young, their mouths 

 usually white; pileus usually glabrous. 

 Stipe furfuraceous, lilac-gray; pileus and 



tubes chocolate-brown. 

 Stipe smooth or reticulate; pileus and 

 tubes of lighter color than above. 

 Spores brownish-ochraceous, 13-IS X 



4-5 m; stipe more or less reticulate. 

 Spores ferruginous-ochraceous, 9-12 X 

 4—5 ij,; stipe rarely reticulate at the 

 top; pileus often olivaceous and 

 spotted. 

 Tubes not stuffed when young. 



Pileus distinctly viscid, glabrous, yellow or 

 fulvous, sometimes more or less 

 reddish-brown; stipe not reticulate. 

 Tubes brick-colored, flesh peppery; 



stipe solid, yellow at the base. 

 Tubes yellow, flesh mild. 

 Stipe hollow, glabrous. 

 Stipe solid, dotted with yellow or 

 red glandules. 

 ■ Stipe solid, not dotted. 

 Tubes pale-greenish; a tropical species. 

 Pileus glabrous or subtomentose, rarely 

 papillate, not viscid. 

 Stipe reticulate, usually very distinctly 

 so. • 



Pileus, tubes, and stipe tawny- 

 brown. 

 Pileus red. 



Context changing to blue when 

 wounded. 

 Stipe bright-lemon-yellow 

 throughout; pileus with- 

 out a bloom. 

 Stipe red below, yellow 

 above; pileus with a bloom. 

 Context not changing to blue 

 when wounded. 

 Pileus chocolate-red, 3-4 cm. 



broad. 

 Pileus testaceous, fading to 

 ochraceous, s-i i cm. broad. 

 Pileus bay, conspicuously 

 papillate, 12 cm. broad. 

 Pileus yellow or brown; tubes yel- 

 lowish. 

 Temperate species. 



16. C. eximius. 



17. C. crassus. 



18. C. affinis. 



19. C. ferruginatus. 



20. C. Curtisii. 



21. C. inflexus. 



22. C. Atkinsonianus. 



23. C. jalapensis. 



24. C. tabacinus. 



25. C. speciosus. 



26. C. Peckii. 



27. C. Rousei. 



28. C. subsanguineus. 



29. C. mirabilis. 



