LACTARIAE OF THE UNITED STATES 49 
22. Lactaria lividorubescens (Batsch) 
Agaricus lividorubescens Batsch, Elench. Fung. 2: 51. ai 36. f. 
202. 1780. 
Agaricus uvidus Fr. Obs. Мус. 2: 191. 1818. 
Lactarius uvidus Fr. Epicr. 338. 1838. 
Lactarius livescens Passerini, Nuovo Giorn. Bot. Ital. 4: 105. 
1872. 
Pileus fleshy, firm, then more lax, rather thin, convex, then 
plane to depressed, often umbonate, cinereous or brownish- -gray, 
tinged with lilac, often faintly spotted and zonate especially when 
young, viscid, glabrous, 4-8 cm. broad, margin at first inrolled 
then spreading except the extreme edge, which remains inrolled 
for some time and is at first white-pruinose to minutely downy ; 
gills white to cream, quickly changing to lilac then violet when 
wounded, sometimes a few forking next the stem, close, thin, of 
various lengths, adnate to slightly decurrent, up to 5 mm. broad ; 
stem white to cream, not spotted or only obscurely so, equal or 
tapering upwards, a little viscid when moist, glabrous, sometimes 
tomentose at the base, stuffed, becoming hollow, 4-8 cm. long, 
6—12 mm. thick ; flesh white, changing to lilac where wounded ; 
spores white, elliptical, echinulate, 7 м x 8-12; latex white at 
first, changing to dark-lilac or violet where in contact with the 
the flesh, acrid, sometimes bitter. 
Нав.: On the ground in woods, in moist places. August 
and September. 
Півтків.: New York, Peck; Maine, White; Vermont, Bur- 
їп йат 63, 1906 ; Connecticut, Earle, Benedict ; Maryland, Ban- 
hos. : Banning, Folio Md. Fungi, ai $0; Batsch, Elench. 
Fung. A. 36. f. 202; Bern. Champ. Roch. AJ. 37. f. г; Britz. 
Lact. 7. 76 ; Cooke, Br. Fungi, ai 991 ; Gillet, Champ. Fr. ai, 
48 (157; 399); Pat. Tab. Analyt. Fung. ai 209. 
DISTINGUISHING FIELD-MARKS: The gray or brownish-gray, 
very viscid pileus, the paler stem, and the lilac color which all 
parts of the plant assume where touched. The pileus may be 
faintly zonate but is never conspicuously zoned or spotted as in 
Lactaria maculata Peck, and the plant is rarely as large as the 
smallest specimens of Lactaria maculata. 
Most European mycologists describe the latex as changing 
color upon exposure to the air. In Monogr. 2: 162, Fries says, 
