18 LACTARIAE OF THE UNITED STATES 
4. Straw-colored, azonate, latex acrid. 20. 2. aspidea. 
Sulphur-yellow, zonate, latex bitter. 21. L. aspideoides. 
ex becoming salmon or reddish, at least where in contact with the fles 
ти glabrous, not сөне ог zoned, 52. Г. jw 
Pileus velvety, seal-brow 54. Г. ligniota. 
Latex becoming glaucous-green * ` 
I. Pileus white, dry, latex very acrid. 6. L. glaucescens. 
DESCRIPTIONS OF THE SPECIES, INCLUDING KEYS, 
ARRANGED BY GROUPS 
I. PIPERATAE 
Pileus without a pellicle and absolutely dry, glabrous of 
tomentose, flesh firm; plants for the most part large; gills not 
becoming darker with age nor pruinose ; latex very acrid, white, 
unchanging except in Lactaria glaucescens, in which it dries glau- | 
cous-green. 
In one species, Lactaria deceptiva, the margin is very involute, 
and is covered with a roll of tangled fine cottony tomentum as in | 
the Zorminosae. 
Synopsis of species 
Latex sip unchanging. : 
Bien di abrou 
Pileus pud gills very close, about 1 mm. broad. 2. L. pergamena. 
Pileus thick ; gills dichotomously forking, 2 mm. broad. 
т. L. piperata. 
Pileus velvety-tomentose. 
з. L. vellerea. 
Gills close. 4. Г. subvellerea. 
Pileus with a cottony roll оп margin, surface glabrous or torn 
. L. deceptiva. 
Plants small, pileus up to 5 cm. broad ; margin involute, minutely silky. 
involuta. 
Latex drying glaucous on broken flesh and gills. 6. b glaucescens. 
I. ГАСТАВТА РІРЕКАТА (L.) Pers. Tent. Disp. Meth. 
Fung. 64. 1797 
Agaricus piperatus L. Sp. Pl. 1173. 1753; Fl. Suec. 373. 1745" 
Not Agaricus piperatus а and В, L. Fl. Suec. 441. 1755. 
Agaricus Listeri Withering, Nat. Arr. Brit. Pl. 4: 156. 19801. 
[Ed. 4.] 
* See also B 2 I, 19, and В II, 9. 
