Part 6, 1916] AGARICACEAE 409 
white or whitish: spores 5-6 X 3-4 u: stipe equal or tapering upward, spongy or stuffed, soft, 
elastic, concolorous or rarely whitish, 5-7 cm. long, 6-10 mm. thick. 
TYPE LOCALITY: Europe. 
Hasirat: Among fallen leaves in woods. 
DISTRIBUTION: Temperate North America as far west as Iowa and Colorado; also in Europe. 
IntustTrations: Ann. Rep. N. Y. State Mus. 48: pl. 24, f. 1-6; Bull. Conn. Geol. Nat. Hist. 
Surv.'3: pl. 19; Cooke, Brit. Fungi pl. 107 (152). 
50. Clitocybe vilescens (Peck) Sacc. Syll. Fung. 5: 184. 1887. 
Agaricus (Clitocybe) vilescens Peck, Ann. Rep. N. Y. State Mus. 33:19. 1883. 
Pileus convex becoming plane or centrally depressed, sometimes irregular, gregarious, 
2.5-4 em. broad; surface glabrous, slightly pruinose on the margin, brown or grayish-brown, 
becoming paler with age, sometimes concentrically rivulose, margin involute: context pale- 
gray; lamellae crowded, adnate or decurrent, cinereous or tinged with dingy-yellow: spores 
subglobose, 5-6 4-5 yu: stipe short, equal, solid, sometimes compressed, grayish-brown with 
whitish tomentum at the base, 2-5 cm. long, 2-4 mm. thick. 
TyPE LOCALITY: Jamesville, New York. 
HasitaT: Bushy places and pastures. 
DISTRIBUTION: New York. 
51. Clitocybe lactariiformis Murrill, sp. nov. 
Pileus convex to expanded, becoming depressed or umbilicate, gregarious, 2-3 cm. broad; 
surface dry, smooth, glabrous, pale-smoky-gray or murinous, darker gray on the disk: context 
very thin, white, the odor not characteristic; lamellae decurrent, arcuate, narrow, subcrowded, 
white: spores ellipsoid, smooth, hyaline, 5 X 3 u: stipe cylindric, smooth, glabrous, hollow, 
usually white but at times concolorous, 3-4 em. long, 2-4 mm. thick. 
Type collected in humus in mixed woods at Unaka Springs, Tennessee, August 18-24, 1904, 
W.A. Murrill (herb. N. Y. Bot. Gard.). 
Hasrrat: In humus in moist, mixed woods. ‘ 
DisTrRrBuTION: Southern Pennsylvania, Virginia, Tennessee, and Alabama. 
52. Clitocybe concava (Scop.) Gill. Champ. Fr. 150. 1874. 
Agaricus concavus Scop. Fl. Carn. ed. 2, 2: 449. 1772. 
Agaricus cyathiformis Fries, Syst. Myc. 1: 173. 1821. Not A. cyathiformis Bull. 1785. 
Agaricus Poculum Peck, Ann. Rep. N. Y. State Cab. 23:77. 1872. 
Pileus fleshy but thin, centrally depressed or infundibuliform, 4-5 cm. broad; surface 
hygrophanous, glabrous or nearly so, blackish-brown or grayish-brown when moist, paler when 
dry, margin smooth or occasionally striate when old: context concolorous, separable into two 
horizontal layers; lamellae distant, adnate or decurrent, united behind, dingy or grayish- 
brown: spores ellipsoid, 8-9 X 4-5 yu: stipe equal or slightly tapering upward, stuffed or hollow, 
fibrillose, obscurely reticulate on account of the fibrils, concolorous, 5-10 cm. long, 2-5 mm. 
thick. 
Type LOCALITY: Carniola. : 
Hasirar: Decaying wood or on the ground in woods or in mossy fields. 
: Opie Temperate North America south to South Carolina and west to Oregon; also 
in Europe. Z : : 
Invustrations: Bull. Herb. Fr. pl. 568, f. 1; pl. 575; Cooke, Brit. Fungi pl. 113 (166); Gill. 
Champ. Fr. pl. 94 (116); Hussey, Ul. Brit. Myc. 2: pl. 1; Lucand, Champ. Fr. #1. 180; Sow. Engl. 
Fungi pl. 363; Vaillant, Bot. Paris. pl. 14, f. 1-3. 
53. Clitocybe fumosa (Pers.) Quél. Champ. Jura Vosg. 214. 1872. 
Agaricus fumosus Pers. Syn. Fung. 348. 1801. 
Pileus fleshy, convex becoming nearly plane, obtuse, somewhat gibbous when young, 
tegular or irregular, gregarious or rarely cespitose, 5—7.5 cm. broad; surface smooth, glabrous, 
sooty-brown, becoming livid when moist, gray when dry: context whitish when dry; lamellae 
crowded, adnate or decurrent, grayish-white: spores subglobose, 6-7 w: stipe nearly equal, 
