Polyporaceaa 



4. Pileus squamose B. spectabilis Boletus. 



4. Pileus not squamose 5 



5 . Tubes whitish or grayish 6 



5 . Tubes yellow or yellowish 7 



6. Flesh white, unchangeable. .B. Elbensis 



6. Flesh white, changing to bluish B. serotinus 



7. Spores globose or broadly elliptical = B. sphaerosporus 



7. Spores much longer than broad 8 



8. Annulus fugacious B. flavus 



8. Annulus persistent . . .B. Clintonianus 



9. Stem dotted with glandules 10 



9. Stem not dotted ...... 1 6 



10. Pileus some shade of yellow . 1 1 



IO. Pileus some other color 15 



1 1 . Stem rhubarb color B. punctipes 



1 1 . Stem some other color . . . . f 12 



12. Stem four lines or more thick 13 



12. Stem less than four lines thick B. Americanus 



13. Pileus adorned with tufts of hairs or fibrils B. hirtellus 



13. Pileus glabrous 14 



14. Stem yellow within B. subaureus 



14. Stem whitish or yellowish-white within B. granulatus 



15. Pileus white B . albus 



1 5 . Pileus not white B. granulatus 



16. Stem squamulose 17 



16. Stem not squamulose 18 



17. Pileus dull red B. dichrous 



17. Pileus some other color v . B. collinitus 



1 8 . Pileous yellow 19 



1 8 . Pileus bay-red or chestnut 20 



1 8. Pileus some other color 21 



19. Flesh pale-yellow B. unicolor 



19. Flesh white B. bovinus 



20. Stem short, one inch or less B. brevipes 



20. Stem longer, two inches or more B. badius 



21. Tubes olivaceous or golden-yellow B. mitis 



2 1 . Tubes ferruginous 22 



22. Taste mild B. rubinellus 



407 



