119 



Pileus some shade of red, at least when young. 

 I'ileus changeable, usually from purplish to olivaceous. 



10. 



14. 



9. Pileus orange, then paler ; flesh white, changing to cinereous. R. decolorans Fr. 



Pileus yellow or orange, disc darker ; flesh white, unchanging, yellow under the 



cuticle. R. aurata Fr. 



10. Stipe white with no reddish tints. 

 Stipe more or less reddish. 



11. Small, pileus 2.5 cm. 

 Larger, pileus 5-12 cm. 



II. 

 13- 



R, pusilla Pk. 



12. Margin of pileus even ; taste peppery. R. paxilloides Earle. 

 Margin furrowed, tubercular ; taste mild or subastringent. R. Integra Fr. 



13. Pileus smooth ; lamellae subdistant, interveined. R. Integra rubrotincta Pk. 



Pileus smooth ; lamellae somewhat crowded, interveined. 

 Pileus punctate ; lamellae not interveined. 



14- 



Lamellae subdistant, interveined. 

 Lamellae crowded. 



R. palustris Pk. 

 R. punctata Gillet 



R. abietina Pk. 

 15- 



15. Stipe soon hollow ; pileus fading to yellowish. 

 Stipe soon hollow ; pileus deep purple, disc black. 

 Stipe stuffed, soft ; pileus 2.5-5 cm - 

 Stipe solid, spongy ; pileus 7-12 cm. 



16. Pileus some shade of yellow. 



Pileus some shade of red, at least when young. 

 Pileus some shade of purple, often variable. 



17. Stipe white or whitish. 

 Stipe ochraceous. 



18. Margin of pileus even. 

 Margin striate with age. 



19. Small ; pileus 2.5-5 cm. 



Larger; pileus 5-10 cm., pale yellow, mild or subacrid. 



20. Pileus light yellow, then pallid ; lamellae saffron. 

 Pileus flesh-color, then yellow ; lamellae ochraceous. 



21. Pileus 4-7 cm.; stipe rosy pruinate. 

 Pileus 15 cm.; stipe glabrous. 



R. puellaris Fr. 



R. puellaris intensior Cke. 



R. nitida (Pers.) Fr. 



R. decolorans Fr. 









17- 









21. 









22. 









18. 





R. 



ochracea 



Fr. 



R 



. lutea 



(Huds.) 



Fr. 

 19. 



20. 





R. 



Jlaviceps 



Pk. 





R. 



vitellina 



Fr. 



P. 



chamacleontina 



Fr. 



R. rostipes (Seer.) Bres. 

 R. alutacea Fr. 



22. Pileus dark purple or blackish-purple. 

 Pileus lighter, fading to pallid. 



23. Stipe red, lamellae yellow from the first. 

 Stipe white, lamellae at first white, changing color when injured. 



R. atropurpurea Pk. 

 New York Botanical Garden. 



23- 



R. nauseosa Fr. 



R. ochrophylla Pk. 



