Part 3, 1910] AGARICACEAE 199 
TYPE LOCALITY: Europe. 
HABITAT: In woods or on the border of woods. 
DISTRIBUTION: Eastern United States from Maine to Alabama, and west to Illinois and Mis- 
souri; Jamaica; also in Europe. 
ILLUSTRATIONS: Bolt. Geschichte pl. 3; Britz. Hymen. Siidb. Lact. 7. 37; Bull. Herb. Fr. Ai. 
224, f.. A, B; Cooke, Brit. Fungi f/. 1002; Gill. Champ. Fr. #1. 172 (393); Lanzi, Funghi Mang. 
pl, 51, f3; Roum. Crypt. Il. Champ. 7. ii; Sicard, Hist. Nat. Champ. Al. 44, f. 238. 
EXSICCATT: Burl, Lact. N. Am. 45, Ellis & Ev. Fungi Columb. 7736 ; Herpeil, Prap. Hutpilze 
48; P, Karst. Fungi Fenn. 510; Thiim. Fungi Austr. 977 ; Sydow, Myc. Mar. 3320. 
70. Lactaria seriflua (DC.) Fries, Epicr. Myc. 345. 1838. 
Agaricus serifluus DC. Fl. Fr. 6: 45. 1815. 
Agaricus gynaecogalus Otto, Versuch Agar. 75. 1816. 
Pileus fleshy, not very thick, plane, then depressed in the center, 5~8 cm. broad; sur- 
face brown-fawn, azonate, dry, glabrous; margin inrolled, then elevated, sometimes flex- 
nous: context firm, whitish; latex semitransparent, resembling whey, mild (acrid fide DC. ), 
scanty; lamellae yellowish, close, decurrent, 2-3 mm. broad; stipe of the same color as the 
pileus, nearly equal, dry, glabrous, solid, shorter than the breadth of the pileus, 4-7 mm. 
thick: spores whitish, subglobular, echinulate, 7-8 « in diameter. 
TYPE LOCALITY: France. 
HABITAT: On the ground in moist shaded places in woods. 
DISTRIBUTION : New York, and possibly in Pennsylvania: also in Europe. 
ILLUSTRATIONS: Berk. Outl. Brit. Fungol. pl. 17, f. 4; Cooke, Brit. Fungi p/Z. 1012; Krombh. 
Abbild. #7. 40, f. 15, 17, 18 ; Iucand, Champ. Fr. pi. 6; Bull. N. ¥. State Mus. 105: pl. 95, f. 7-11, 
EXsiccatt: Sydow, Myc. Mar. 6/1. 
71. Lactaria isabellina Burl. Bull. Torrey 
Club 34: 88. 1907. 
Pileus fleshy, not very thick, convex, then broadly convex, at length infundibuliform, 
umbonate, 3-4.5 cm. broad ;' surface red-fulvous in the center, buff toward the margin, all 
fading to buff when mature, azonate, dry, glabrous, somewhat roughened and wrinkled in 
the center especially when old; margin arched, glabrous, even or at length faintly striate, 
sometimes areolate-wrinkled : context rather firm, white, staining yellowish from the latex ; 
latex white, at length (after five minutes or less) becoming sulphur yellow, or at least 
staining the lamellae and flesh yellow, astringent, then acrid, abundant; lamellae pale- 
yellowish, or tinted with the same color as the pileus, becoming reddish where bruised, 
forking near the stipe or midway to the margin of the pileus, close, thin, slightly decurrent, 
3 mm. broad; stipe of the same color as the pileus, equal or slightly tapering upwards, 
tomentose at the base, stuffed, becoming hollow, 4 cm. long, 6 mm. thick: spores white, 
slightly echinulate, 6-7.5 4 X 7-8.5 p. 
TYPE LOCALITY: Newfane, Vermont. 
HaBitaT: In leaf-mold or sphagnum, moist, mixed or spruce woods. 
re eae Vermont, and Chestnut Bald (1500 meters elevation), Pisgah Forest, North 
ILLTISTRATION: Mem. Torrey Club 14: 103. f. 25. 
Exsiccatr: Burl. Lact. N. Am. 46. 
72. Lactaria mutabilis Peck, Ann. Rep. N. Y. State 
Mus. 43: 66. 1890. 
Pileus fleshy, thin, convex, then nearly plane, 5-10 cm. broad; surface reddish-brown, 
darker in the center, and zoned with darker rings of confluent spots when moist, azonate 
when dry, moist but not viscid, glabrous ; margin glabrous: context colored like the sur- 
face, odorless ; latex white, unchanging, mild; lamellae whitish, becoming tinted with yel- 
low in the mature plant, close, adnate, broader than the thickness of the pilens; stipe of 
the same color as the pileus, equal or tapering upwards, glabrous, stuffed, 2.5-5 cm. long, 
6-10 mm. thick: spores subglobose, echinulate, 7.5 4 in diameter. 
TYPE LOCALITY: New York. 
HaBITaT: Low damp places. 
DISTRIBUTION : New York. 
. ILLUSTRATION: Ann. Rep. N. Y. State Mus. 43: Al. 7, 4. [-4/. 
