LACTARIAE OF THE UNITED STATES 15 
** Latex bright-colored from the first 
| г. DAPETES. Pileus тараны viscid when wet, spores yellowish, latex not very 
| acrid ; plants е 
Wounds becoming оын at least after some time. ІХ. DELICIOSAE. 
Wounds not becoming greenish. ХУ. L. salmonea. 
Key to the known species of Lactaria in the United States * 
mu wu 
Latex bright-colored from the first. А 
atex white, unchanging. B 
Latex becoming yellow, at least where in contact with the flesh. C 
Latex becoming lilac, at least where in contact with the flesh. D 
Latex becoming к or reddish, at least where in contact with the flesh. E 
Latex becoming glaucous-gree F 
Latex bright-colored from the first 
1. Pileus more or less zonate. 2 
Pileus azonate, whitish, latex salmon-colored. 57. L. salmonea, 
2. Latex indigo-blue or paler 242 igo. 
Latex dark-red. за. L. Дери: cram 
Latex orange- terri then red-orange. . L. deliciosa. 
Latex saffron-yell 31. 1. EC E 
Latex white, unchanging 
Pileus never viscid, 
Pileus viscid when young or wet. %П 
| 1 
| 1. Latex very а 2 
1 Latex mild or ae acrid. II 
| 2. Pileus white. z 3 
1 Pileus colored. 8 
3. Surface glabrous. 4 
Surface not glabro 6 
4. Margin naked, plants large 5 
Margin silky, plants small. 7. L. involuta. 
3 5. Flesh tbin, gills becoming straw-colored, 1 mm. broad. 2. L. pergamena. 
| Flesh thick, gills dichotomously branching, 2 mm. broad. I. Г. piperata. 
| 6. et velvety-tomentose. 
glabrous or torn, margin cottony-tomentose. 5. L. deceptiva. 
7. Gifs ы. ‘oad. 3. L. vellerea. 
Gills close, narrow, cinnamon-colored in drying. 4. Г. subvellerea. 
8. Pileus glabrous, at least when mature. 9 
Pileus scabrous-hairy, olivaceous. g. L. atroviridis. 
9. Red. IO 
Gray, mixed with brown, zonate, moist. 8. L. rusticana. 
то. Umbonate, 44. L. rufa. 
* [n the keys preceding the groups will be found the doubtful American species and 
the European species which have been reported from the United States, but the occur- 
rence of which is uncertain 
