12 LACTARIAE OF THE UNITED STATES 
in either the pale azonate or the darker zonate forms. While the | 
size of the pale forms is usually much less than that of the darker, 1 
I have found typical forms of the species as small as the size | 
given for Г. órevis Peck. Тһе stem of plants of Z. theiogala grow- 
ing in dry woods is usually firm and stuffed. Since the distin- 1 
guishing characteristics given for Z. órevis— white or whitish | 
color, smaller size, solid or stuffed stem, and absence of tomentum 
from the base of the stem — аге all present in Г. ¢hetogala under | 
varying conditions of habitat, and intermediate forms exist between | 
the typical Г. brevis Peck апа Г. theiogala (Bull) Fr., I am in- | 
clined to regard the former as а form of the latter due to eco- | 
logical factors. Z. brevipes Longyear I believe to be founded on | 
immature specimens of a small pale form of 2. theiogala and prob- | 
ably the same as Г. brevis Peck. 1 
The type specimens of Г. xanthogalacta correspond to small 4 
plants of Z. theiogala. This species was described from dried | 
plants collected in California and the accompanying field-notes indi- 
cated that the milk was yellow, upon which character the species | 
was based. But since the latex of Z. theiogala often becomes | 
yellow so quickly as to seem to be yellow from the first, and ` 
since the type specimens of Z. xanthogalacta resemble exactly 21 
similar specimens of L. thetogala, I have no doubt as to their 
identity with the latter species. 
Fo 
41. LACTARIA COLORASCENS Peck, Bull. N. Y. St. Mus. 94: 35: 
1905. [As Lactarius] 
Pileus fleshy, thin, nearly plane, becoming depressed in the 
center, whitish at first, becoming brownish-red with age, geen 
moist, glabrous, 2-5 cm. broad; gills whitish, becoming со e 
like the mature pileus, close, thin, adnate, or slightly decurrent; 
stem whitish, then brownish-red, equal, even, solid, 2.5-4 сш, on 
4-6 mm. thick ; spores globose, echinulate, 8 и; milk white, be- 
coming sulphur-yellow, bitter. E: 
Нав.: Woods. August. 
DisrRiB: New York, Peck, Atkinson (Long Island). S 
DISTINGUISHING FIELD-MARKS: The change in color from pallid | 
in young specimens to brownish-red in the mature plants, and Ge 1 
bitter white milk which becomes sulphur-yellow upon exposure 19 
the air. Peck says that the color of the mature plants is 91 
to that of 2. camphorata. 
Wu 
