Када ааа жаздадым ын рада релі да. 
ИО a MET HP PESE 1. E EE ИРИНА 
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4 
LACTARIAE ОЕ THE UNITED STATES 75 
ported from North Carolina by Schweinitz, from Maine by Ricker, 
from Ontario, Canada, by Guillet. 
Плозт.: Bies. Fung. Trid. ai 39, 127; Britz. Lact. f. 30 
(very poor); Cooke, Br. Fungi, 2/. 994. 
Exsic. : Sydow, Mycotheca Marchica 2779. 
DISTINGUISHING FIELD-MARKS: The rather large size, the tawny 
buff-colored, dry, floccose-squamulose pileus, the usually watery 
milk, and the aromatic odor, which persists in drying. 
Fries describes the latex as white except when the plant is 
growing in wet places. Romell says “ The milk is watery ; I have 
never found it white” ; and Stevenson writes in British Fungi, 
“Те occurs most frequently in marshes with watery juice." Thus 
far the American form has been found only with watery juice, and 
on this characteristic Peck has described it as a distinct species, 
L. aquifluus. Не says “ I have never found this plant with a white 
or milky juice, and therefore I am disposed to regard it not as a 
variety of Г. he/vus, but as a distinct species." Тһе type spec- 
imens of Lactarius aquifluus agree т form and color with the 2779 
Sydow, with Hennings’ Berlin specimens, and with specimens sent 
from Stockholm by Romell. Since also the European plant occurs 
most frequently with watery juice, it would seem hardly possible 
to separate our plant as a distinct species, but Z. helva may be con- 
sidered as showing a variation in the character of the latex from 
white to watery, the latter being the usual form. It is probable 
that this difference in the latex is due to ecological conditions, but 
the mushroom most commonly grows in wet mossy places, and 
the prevailing form of the species scarcely seems to be degenerate, 
as Fries suspected ; we probably have rather a hydrophilous plant, 
which in the dry condition might have more scanty white latex. 
The short-stemmed form I consider to be due to habitat. 
44. LACTARIA RUFA (Scop.) Fr. Epicr. 347. 1838. [As Lacta- 
rius.] —Schrot. in Cohn, Krypt.-Fl.Schles. 3: 539. 1889 
Agaricus rufus Scop. Fl. Carn. 2: 451. 1772. 
Pileus fleshy, not very compact, rather thin, convex, umbonate, 
at length infundibuliform, bay-red to rufous, not fading, azonate, 
dry, minutely flocculose-silky, then glabrous and shining, 5-10 
cm. broad, margin involute at first, whitish-downy, then glabrous ; 
gills ochraceous, then rufous, sometimes forking, close, somewhat 
