American Boletes 



Tubes large; pUeus 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 



11-14 li long. 

 Context white, tinged 

 with pink; spores 

 7-9 n 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. (dabamensis. 



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. 



