Part 4, 1915] AGARICACEAE 209 
rimulose, pellicle not easily separating; margin even, inrolled for some time: context white, 
slightly yellowish or smoke-colored where exposed in drying, firm, mild in taste, odor not 
pronounced; lamellae cream-colored, alutaceous in drying, mostly equal, forking near the stipe 
or sometimes anastomosing midway to the stipe, narrowed at the inner ends, rounded at the 
outer, not dusted with the spores; stipe white tinged with pink, subequal to ventricose, spongy 
but firm, under the lens pruinose in the upper portion, somewhat areolate at the base, 5-6 cm. 
long, 3 cm. thick: spores pale-yellow, globose, echinulate, 10 » in diameter. 
TYPE LOCALITY: Europe. 
Hasirat: In coniferous forests or in mixed woods. 
DIstTRIBUTION: Michigan and Colorado; also in Europe. 
ILLUSTRATIONS: Cooke, Brit. Fungi pl. 1053, 1074; Gill. Champ. Fr. pl. 178 (640); Ricken, 
Blatterp. Deutschl. gl. 17, f. 3; Schaeff. Fung. Bavar. pl. 214, 215. 
Exsiccati: Roum. Fungi Sel. 5322. 
16. Russula lactea (Pers.) Fries, Epicr. Myc. 355. 1838. 
Agaricus lacteus Pers. Syn. Fung. 439. 1801. 
Hypophyllum integrum Paulet & Lév. Ic. Champ. 34. 1855. 
Pileus fleshy, compact, campanulate, then convex and at length spreading and depressed 
in the center, often eccentric, up to 10 cm. broad; surface white, then tinged with alutaceous, 
dry, becoming rimulose-areolate to squamulose; margin even, thin, obtuse: context mild in 
taste; lamellae white, a few short ones present, forked, distant, thick, rigid, rather broad; 
stipe white, solid, firm, spongy within, 4-5 cm. long, up to 4 cm. thick: spores white, sub- 
globose, echinulate, 8-9 * 9-10 u.. 
Types Locarity: Europe. 
Hasirtar: On the ground in mixed woods. 
DIsTRIBUTION: Mississippi; also in Europe. 
ILLUSTRATIONS: Barla, Champ. Nice #1. 15, f. 11-13; Cooke, Brit. Fungi $1. 1070; Gill. Champ. 
a ana (var. incarnata); Paulet & Lév. Ic. Champ. 1. 74, f.2; Richon & Roze, Atl. Champ. pl. 
40, f. 9-11. 
III. Crustosae. Pileus without separable pellicle; surface green, dry or viscid when wet, 
breaking up into scales like those on an Amanita, or into smaller mealy-like granules, or velvety- 
tomentose from the first; margin even, but sometimes obscurely striate in age: context white, 
unchanging, moderately firm, mild or tardily acrid, without special odor; lamellae with some 
short ones intermingled and some forking, narrow at the inner ends and rounded at the outer: 
spores white or pale-yellow. 
17. Russula crustosa Peck, Ann. Rep. N. Y. State Mus. 39: 41. 1887. 
Pileus convex, becoming nearly plane or centrally depressed, 5-12 cm. broad; surface 
variable in color, stramineous, pale-ochraceous, brownish-ochraceous, greenish or greenish- 
yellow, rarely brownish-purple, viscid when wet, with small, appressed, areolate scales, except 
on the smooth disk; margin striate when mature: context white, mild or slightly and tardily 
acrid; lamellae white, some short, some forked, narrowed toward the stipe, moderately close; 
stipe white, equal, stuffed or hollow, 3-6 cm. long, 1.2-2.5 cm. thick: spores white, subglobose, 
8-10 uw in diameter. 
TyPs LocaLity: New York. 
Hasirat: In woods and open places in woods. 
_ DISTRIBUTION: From Connecticut west to Michigan and Ohio and south to Alabama and Missis- 
“PPT LUSTRATIONS: Bull. N. V. State Mus. 67: pl. 84, f. 1-7. 
18. Russula virescens (Schaeff.) Fries, Epicr. Myc. 355. 1838. 
Agaricus virescens Schaeff. Fung. Bavar. 4: Ind. 40. 1774. 
.Pileus fleshy, globose, becoming convex, then nearly plane and often centrally depressed, 
5-12 cm. broad; surface green or grayish-green, dry, with small, flocculose patches or warts 
resembling those of Amanita; margin even, rarely slightly striate in old specimens: context 
white, mild in taste; lamellae white, a few short ones present, some forking, narrow toward 
the stipe and nearly or quite free, rather close; stipe white, firm, nearly equal, 2.5—5 cm. long, 
1.2-2 em. thick: spores white, subglobose, echinulate, 7 X 8 u. 
