LACTARIAE OF THE UNITED STATES 57 
DISTRIB. : Vermont, Burlingham Qr, 1906; North Carolina, 
1000 meters elevation, Burlingham 92, 1907 (type). 
DISTINGUISHING FIELD-MARKS: This species may be easily 
recognized by the contrasting dark-sepia color of the center, the 
whitish color of the margin of the pileus, and its slimy shining 
appearance, as well as by the blue-greenish-gray color of the 
dried latex. It closely resembles Lactaria cinerea Peck in size and 
texture, but differs in the habitat, in the color of the pileus, and in 
the change in color of the more acrid latex. While Z. cinerea is 
most abundant in August, Z. mucida does not appear until late in 
August and is most plentiful in September. І have found it only 
under hemlock trees, while 2. cinerea seems to grow only under 
beech trees. From 2. тотай it may be distinguished by the white 
spores, the smaller size, the morelax flesh, and the absence of lilac 
tints in the color of the pileus, which does not become yellowish in 
fading. 
IX. DELICIOSAE 
Latex deep-colored and rathér mild, pileus viscid; wounds, or 
even the entire plant when old, often becoming greenish ; spores 
yellowish. 
Three species have been described from Europe, Zactaria del- 
ictosa, Lactaria sanguiffua, and Lactaria haemorrhea Lowe, the 
first alone being common to Europe and America. Тһе remain- 
ing three species have been reported only from North America. 
All of the species resemble Lactaria deliciosa L. in many respects 
and form with it a natural group of which it may be taken as the 
type. Lactaria Chelidonium is most closely related to Lactaria 
deliciosa, while Lactaria subpurpurea appoaches Lactaria sanguiflua. 
Lactaria Indigo diverges more from the type. JL. salmonea Peck 
seems to belong rather with the Fudiginosae. 
Synopsis of species 
Latex¥orange-colored. зо. Lactaria deliciosa. 
Latex'saffron-yellow. 31. Lactaria Chelidonium. 
Latex dark-red 32. Lactaria subpurpurea, 
Latex indigo-colored. 33. Lactaria indigo. 
