LACTARIAE ОЕ THE UNITED STATES 95 
ture plants, the dark color of the pileus, which inclines more to 
Vandyke-brown than to fulvous, the paler stem, the velvety- 
pubescent covering of the pileus and the lower portion of the 
stem, and the more or less corrugated condition of the pileus. 
There is but little or no odor, and the wounds of the gills do not 
turn brown so quickly as іп L. Јасна. 
The species is closely related to Г. /acziffua. The specific name 
refers to the corrugated surface of the pileus, but since L. /асийиа 
occurs with a rugose pileus, the specific differences seems to me 
to be in the velvety-pubescent covering of L. corrugis, the more 
livid color of the plant, the absence of the strong odor which is 
characteristic of Г. /actiflua, and the larger spores and cystidia. As 
а rule the cystidia of Г. /actifiua are paler. 
62. LACTARIA LUTEOLA Peck, Bull. Torrey Club 23: 412. 1896. 
[As Lactarius] 
Lactarius foetidus Peck, Bull. N. Y. St. Mus. 54: 949. 1902. 
Pileus fleshy, firm, broadly convex or nearly plane, somewhat 
depressed in the center, whitish to yellowish-buff (370), azonate 
or sometimes with a depressed zone near the margin, dry, minutely 
pruinose-velvety, sometimes slightly rugose, 5-8 cm. broad, margin 
involute at first, then arched or spreading ; gills white, then yel- 
lowish, becoming brown where injured, some forking near the stem, 
close, adnate, or slightly decurrent, narrow ; stem of the same color 
as the pileus, nearly equal, dry, somewhat pruinose-velvety, stuffed, 
2-6.5 cm. long, 6-12 mm. thick; flesh whitish, staining brown 
where injured; spores white, subglobose, echinulate, 7.5-8 м; 
latex white, staining the flesh and gills brown, mild, abundant. 
Нав.: Mixed woods, among fallen leaves, in dry or fairly 
moist soil. July, August, and September. 
DISTRIB. : Massachusetts, Webster (type specimens); New 
York, Peck, Earle 840; Connecticut, Hanmer 534; Tennessee, 
518 meters, Murrill 960 ; Ohio, Beardslee ; Missouri, Glatfelter ; 
Mississippi, Earle. 
Плозт.: Bull. М. Y. St. Mus. 67: X. 83. f. 7-11. 
DISTINGUISHING FIELD-MARKS: The whitish to yellowish-buff 
color of the pileus and stem, the minutely velvety covering, and 
the white, close narrow gills which stain brown where wounded. 
The latex is very abundant, and according to Peck becomes brown 
