AMERICAN BOLETES 



Including species occurring in North America, Central America, 

 the West Indies, and all other islands between North America 

 and South America with the exception of Trinidad. The tropi- 

 cal representatives of the family are extremely limited, both in 

 number and distribution. 



BOLETACEAE 



Hymenophore annual, nearly always terrestrial and centrally 

 stipitate; context fleshy; hymenium poroid, fleshy, never gela- 

 tinous. 



Tubes not arranged in radiating rows (except in one or 



two species of Boletus). 

 Spores hyaline, often becoming yellowish; stipe hollow, 



not reticulate. 



Spores rosy or flesh-colored; stipe solid, usually reticu- 

 late. 

 Spores ochraceous to brown or black. 



Stipe neither glandular-dotted nor annulate. 



Mouths of tubes never uniformly red nor red- 

 dish-brown, tubes unicolorous. 

 Mouths of tubes red or reddish-brown, tubes 



yellowish within. 



Stipe either glandular-dotted or annulate. 

 Stipe glandular-dotted, exannulate. 

 Stipe annulate, glandular-dotted in some species. 

 Spores ochraceous to yellowish-brown, 



smooth, usually oblong-ellipsoid. 

 Sporophore not covered with a yellow 



powder. 



Pileus smooth, viscid. 

 Pileus floccose-verrucose, dry. 

 Sporophore covered with a conspicuous 



yellow powder. 



Spores brownish-black, rough, subglobose. 

 Tubes arranged in radiating rows. 

 Stipe exannulate. 

 Stipe annulate. 



i. GYROPORUS Quel. 



Hymenophore annual, terrestrial, centrally stipitate; surface 

 dry, minutely tomentose to floccose-squamose ; context white, 



i 



i. GYROPORUS. 



2. TYLOPILUS. 



3. CERIOMYCES. 



4. SUILLELLUS. 



5. ROSTKOVITES. 



6. BOLETUS. 



7. BOLETELLUS. 



8. PULVEROBOLETUS. 



9. STROBILOMYCES. 



10. BOLETINELLUS. 



11. BOLETINUS. 



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