LACTARIAE ОЕ THE UNITED STATES Si 
2. LACTARIA PERGAMENA (Swartz) Ет. Epicr. 340. 1838. [As 
Lactarius.] — Schrót. in Cohn, Krypt.-Fl. Schles. 
3:.537.. 1889 
Agaricus pergamenus Swartz, Kongl. Sv. Vet.-Akad. Nya Handl. 
30: 90. 1809. 
Pileus fleshy, pliant, thin, convex to plane or depressed, often 
irregular and eccentric, and usually flexuous, white to creamy- 
white when old, azonate, dry, glabrous, minutely wrinkled, 4-11 
cm. broad ; gills white, then straw-colored, very close, thin, fork- 
ing, adnate, horizontal, very narrow (г mm. broad); stem white, 
equal or tapering downwards, glabrous, smooth, stuffed} but firm ; 
spores white, minutely echinulate, elliptical, 8 x би; flesh white ; 
latex white, abundant, acrid. 204е. 
Нав.: In dry oak woods. August, September. 
DISTRIB. : New York, Peck, Burlingham (120 meters elevation); 
Vermont, Frost; Connecticut, Earle; Virginia, Murrill; North 
Carolina, 1,000 meters elevation, Burlingham 39, 1907 ; Alabama, 
Earle ; Ohio, Morgan, Dawson ; Tennessee, 500 meters elevation, 
Murrill 517; Mississippi, Eae. 
IrLusr.: Batsch, Elench. Fung. M. 73. f. 59, а, 6, с. Agaricus 
piperatus; Britz. Lact. f. ro; Cooke, Br. Fungi, ai 978; Gillet, 
Champ. Fr. A. 152 [389]*; Krombh. Abbild. ai 57. f. 1-6; 
Lucand, Champ. Fr. ai 42. l 
Dist FIELD-MARKS: This species is very closely 
related to Lactaria piperata, and is often confused with it. Accord- 
ing to Fries it differs from Lactaria piperata in having a stuffed 
stem which at length becomes spongy, and is longer, tapers down- 
wards, and is perfectly glabrous; in the thinner, pliant, elastic, 
often irregular and eccentric, and for the most part, flexuous pileus, 
which is at first convex and not umbilicate, then rather plane, and 
wrinkled in a peculiar manner ; in the gills being adnate, very close 
and very narrow, always straight and plane, and soon becoming 
straw-colored. The latex is more abundant in the flesh than in 
the gills. 
Lactaria pergamena is not so common as Lactaria piperata. 
The latex sometimes dries sulphury-white (74. 2. 2). 
* The plates in Gillet’s Champ. Fr. were renumbered in 1890 and again іп the 
final edition. In citation I have given the original number and in brackets the numbers 
which occur in the subsequent revisions. 
