LACTARIAE OF THE UNITED STATES 
Without umbo. 47. L. rufula. 
. Pileus iiie 12 
ileus squamulose to floccose-squamulose. 2I 
Pileus velvety, or minutely tomentose. : 26 
. Gills not changing color where wounded. 13 
Gills Sege color where wounded. 18 
. Pileus fulvous to isabelline 14 
Pileus Ке stem and gills concolorous. 53. Z. Sumstinei. 
Pileus zonate when moist. 69. L. mutabilis. 
Pileus azonate. I5 
IS. Latex white or sometimes bluish-white to watery and thin. 16 
Latex whey-colored, pileus fading. 67. Г. seriffua. 
16, Pileus polished, not fadin I 
ileus becoming areolate, fading, latex watery. 65. Z. rimosella. 
17. or none. 66. L. subdulcis. 
Aromatic, stronger in drying. 64. L. camphorata. 
18. Gills becoming greenish where wounded. 19 
ills becoming brown where wounded. 20 
I9. Pileus about 3 cm. broad, umber-colored. 70. L. parva. 
Pileus up to 7.5 cm. bind, grayish, often roughened. 71. L. varia. 
20. Pileus azonate. 58. Г. /actifiua. 
Pileus zonate. бо. L. ichorata. 
21. Pileus fulvous to isabelline. 
Pileus gray. 2 
22. Odor none, latex white. 46. L. alpina, 
Aromatic, latex watery. 43. L. helva. 
23. Odor none. 24 
ie бо. Г. glyciosma. | 
24. Pileus = floccose-squamulose. gris 
Pileus zo 25 
25. Plants very weg? blue-black to slate-colored, stem glabrous. 49. Z. Bensleyae. 
Plants larger, paler, stem pubescent. 51. L. Hibbardae. 
26. Pileus azonate. 27 
Pileus zonate, brick-red. 45. L. Pec£ii. 
: 27. Wounds becoming brown or fulvous. 28 
Wounds not changing color. 29 
28. Pileus yellowish-buff, gills close, 62. L. luteola. 
Pileus Vandyke-brown, corrugated. бі. L. corrugis. 
29. Pileus brown, Е distant. 55. L. Gerardit. 
Pileus pe fulvo 31 
30. Gills distan wë? i. асана 
; . L. subvelutina 
& II. Pileus viscid when young or wet 
I. Latex acrid. 
Latex mild or slowly acrid. 
2. Margin of pileus involute at first, with long tomentum 
Margin of pileus involute at first, with tomentum дш I mm. long, soon naked. 
Margin of pileus naked, pileus g 1 
3. 
Pileus whitish, entirely covered vis matted tomentum, d nd cilicioides. 3 
Poni er, zonate. L. torminosā. ` 
ке їп м Center 
Е. 
d 
