48 LACTARIAE ОЕ THE UNITED STATES 
DISTINGUISHING FIELD-MARKS: The pale-yellow or straw-colored | 
pileus, the absence of zones, and the acrid latex. 
This species has been found but once in the United States. 
Peck notes that the stem was not spotted in his specimens, and 2 
that the spores were broadly elliptical or subglobose. 
Lactarius uvidus Krombh., which has commonly been referred 
to Lactaria aspidea Fr., does not seem to me to agree closely | 
enough to warrant considering it this species. Krombholz de- 
scribes the color of the pileus as “ braun," and that of the stem and | 
gills as white. 
21. LACTARIA ASPIDEOIDEs Burl. Bull. Torrey Club 34: 87. 
1907. [As Lactarius] : 
Pileus fleshy, rather firm, convex-umbilicate, then plane, becom- | 
ing infundibuliform with age, sulphur-yellow (18) with narrow zones | 
of butter-cup yellow (22), glabrous, 3-4.5 cm. broad, very viscid | 
when wet, gluten thick and persisting, margin involute and minutely A 
tomentose at first, then spreading and glabrous; gills whitish, | 
then cream-colored spottéd with yellow, staining lilac where | 
wounded, sometimes forking next the stem, close, adnate, but - 
acute at the inner end, 4 mm. broad; stem sulphur-yellow, often | 
spotted with butter-cup yellow, equal or abruptly smaller at the ` 
base, viscid when young or wet, glabrous, stuffed, becoming hol: 
ow, 2-3.5 cm. long, 6-10 mm. thick; flesh whitish, changing t° | 
faintly lilac where exposed to the air; spores white, globular to = 
broadly elliptical, echinulate, 5-7 » x 7-8 и; latex white, becoming | 
lilac where in contact with the broken flesh, taste bitter. E 
Нав. : In grassy hillside sheep-pasture near small fir trees, after ` 
heavy rain and warm weather. September. 5" 
Distris.: Vermont, 523 meters, Burlingham 115, 1906. 
DISTINGUISHING FIELD-MARKS: The bright-yellow color of the | 
entire plant, the very viscid zonate and glabrous pileus, the broad, ` 
short, chaff-like tomentum on the extreme edge of the young pileus, | 
and the lilac color assumed by the wounded flesh or gills. e 
latex does not seem to change color except where in contact with | 
the flesh. This species is most closely related to Г. aspideus Fr, | 
but differs in its brighter color, the zonate pileus, the smaller size, a 
and the bitter latex. It can readily be distinguished from 2. spe : | 
05а, since the pileus of the latter is covered with long tomentum | 
and is pallid, with honey-colored zones. Z. aspideoides is also à 
much smaller plant. 
