AMERICAN BOLETES 



Tubes large; pileus subto- 



mentose. 

 Tubes of medium size; pileus 



usually glabrous. 

 Stipe white; pileus avel- 

 laneous-isabelline, very 

 light in weight. 

 Stipe yellow or yellowish- 

 brown. 

 Context yellow; spores 



1 1-14 p. long. 

 Context white, tinged 

 with pink; spores 

 7-9 M long. 

 Tropical species. 



Pileus 2-3 cm. broad, floc- 



cose-tomentose. 

 Pileus 7 cm. broad, glabrous. 

 Stipe not reticulate. 

 Pileus glabrous. 



Pileus red; eastern species. 



Stipe yellow, sometimes with 

 red stains; entire plant 

 quickly changing to blue 

 a tany point where touched. 

 Stipe red, yellow at the top; 

 flesh and tubes slowly 

 turning blue when wound- 

 ed. 



Pileus bay; western species. 

 Context white, unchanging. 

 Context cremeous, unchang- 

 ing. 

 Pileus yellow or brown. 



Tubes changing to blue when 



wounded; stipe glabrous. 

 Tubes not changing to blue 



when wounded. 

 Stipe furfuraceous, pale- 

 yellow; tubes pale- 

 yellow to greenish- 

 yellow. 



Stipe rough with minute, 

 stiff, black hairs; tubes 

 brown to black. 

 Pileus subtomentose; flesh usually 



spongy and drying readily. 

 Tubes not changing to blue when 

 wounded. 



30. C. illudens. 



31. C. subpallidus. 



32. C. retipes. 



33. C. alabamensis. 



34. C. guadalupensis. 



35. C. Maxoni. 



36. C. miniato-olivaceus. 



37. C. bicolor. 



38. C. oregonensis. 



39. C. Zelleri. 



40. C. pallidus. 



41. C. subglabripes. 



42. C. scabripes. 



