l8 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



5. Cap somewhat depressed or funnel-shaped, blood-red; 



gills crowded, narrow, somewhat decurrent. .R. sanguinea 

 Cap convex, then plane, not blood-red ; gills crowded, 

 broad, not decurrent 6 



6. Taste slowly acrid ; cap flesh-colored, becoming dingy- 



white R. rosacea 



Taste not acrid; cap pale red or rust-colored. . .R. depaUens 



7. Margin of cap at first bent inward 8 



Margin of cap not at first bent inward 10 



8. Flesh changing to red when broken ; cap becoming 



black R. nigricans 



Flesh white, not changing color on exposure to air. . . . 9 



9. Stem very short, white R. hrevipcs 



Stem longer, gray-black R. adusta 



10. Cap without viscid cuticle, absolutely dry, margin not 



grooved 11 



Cap with viscid cuticle, especially in rainy weather, 

 margin grooved or covered with wart-like swellings 16 



11. Cap bright yellow R. Havida 



Cap not yellow 12 



12. Cap green or pallid with no tinge of red ; gills 



white , R. virescens 



Cap not green, tinged with red, pink, or purple 13 



13. Cap white or tinged with pink at margin R. albella 



Cap not white 14 



14. Taste very acrid; flesh white, somewhat red under 



cuticle R. rubra 



Taste mild 15 



15. Cap blood-red ; stem 3 inches long, i inch thick. . . .R. lepida 

 Cap dingy purple, turning olive-colored ; gills yellow 



R. olivacca 



16. Gills white 17 



Gills yellow 19 



17. Taste mild ; cap clear yellow R. citrina 



Taste acrid 18 



18. Cap I to i>4 inches broad R. fragilis 



Cap 3 to 4 inches broad R. emctica 



19. Cap dark purple R. atropurpnrea 



Cap red or yellow 20 



