12 NORTH AMERICAN FLORA [VOLUME 10 



broadly ellipsoid, often with a shining nucleus, 7.5-8.7X5-6 n; stipe short, equal or tapering 

 upward, hollow, slightly silky, concolorous or a little paler, 2.5-4 cm. long, 2-4 mm. thick. 



Type locality: Sandlake, New York. 



Habitat: Gravelly soil in fields. 



Distribution : Known only from the type locality. 



25. Melanoleuca magna (Banning & Peck) Murrill. 



Tricholoma magnum Banning & Peck; Peck, Ann. Rep. N. Y. State Mus. 44: 179. 1892. 



Pileus fleshy, hemispheric to expanded, 15 cm. broad; surface smooth, silky, cream-colored; 

 context white, firm; lamellae white then pale-salmon or cream-colored, adnate, emarginate, 

 not crowded; spores not present; stipe short, solid then hollow, base attenuate. 



Type locality: Baltimore, Maryland. 

 Distribution: Known only from the type locality. 



26. Melanoleuca praemagna Murrill, sp. nov. 



Pileus large and fleshy, convex to plane, becoming deeply fissured with age or on drying* 

 gregarious, reaching 12-20 cm. broad; surface dry, smooth, glabrous, white, margin involute 

 and minutely downy when young, becoming expanded and glabrous; context thick, white; 



lamellae sinuate-adnexed, often with a decurrent tooth, broad, ventricose, crowded, white, 

 becoming dirty-yellowish or brownish on drying ; spores ellipsoid, smooth, hyaline, pure- white 

 in mass, 6-7 X 3-4 ju ; stipe very short, thick and bulbous, smooth, glabrous, white, reaching 

 5-6 cm. long and 4-5 cm. thick, the bulb being nearly twice this thickness. 



Type collected on the crumbling walls of an old sod-house in Saskatchewan, Canada, September 

 6, 1913, L. H. Pennington. Also collected on high land under sagebrush, near Gunnison, Colorado, 

 August 24, 1899, E. Bartholomew 2611%. 



Distribution: Saskatchewan and Colorado. 



27. Melanoleuca trentonensis (Peck) Murrill. 



Agaricus (Tricholoma) trentonense Peck, Ann. Rep. N. Y. State Mus. 24: 60. 1872. 



Pileus thin, convex or nearly plane, often irregular, gregarious or subcespitose, 2.5-5 cm. 

 J>road; surface glabrous or subvirgate, hygrophanous, slightly striatulate on the margin when 

 moist, dingy- white, the disk generally brown ; lamellae very narrow, crowded, slightly emargin- 

 ate, white inclining to yellowish; spores ellipsoid, pointed at one end, smooth, hyaline, 5-7X3-4 

 fi; stipe short, equal, solid, slightly striate, white, 2.5-4 cm. long, 6-10 mm. thick. 



Type locality: Trenton Falls, New York. 

 Habitat: Soil and rotten wood in woods. 

 Distribution: New York. 



28. Melanoleuca fumescens (Peck) Murrill. 



Agaricus (Tricholoma) fumescens Peck, Ann. Rep. N. Y. State Mus. 31: 32. 1879. 



Pileus convex or expanded, 2.5 cm. broad; surface dry, clothed with a very minute ap- 

 pressed tomentum, whitish ; lamellae narrow, crowded, rounded behind, whitish or pale-cream- 

 colored, changing to smoky-blue or blackish when bruised or on drying ; spores oblong-ellipsoid, 

 5-6.5 m long; stipe short, cylindric, whitish, 2.5-4 cm. long, 4-6 mm. thick. 



Type locality: Copake, New York. 

 Habitat: Ground in woods. 

 Distribution: New York. 

 Illustration: Hard, Mushrooms/. 54. 



29. Melanoleuca lata (Peck) Murrill. 



Tricholoma latum Peck, Bull. N. Y. State Mus. 167: 31. 1913. 



Pileus fleshy, firm but flexible, broadly convex or nearly plane, gregarious, reaching 5-10 

 cm. broad ; surface moist, glabrous, white or whitish ; context white, taste diagreeable ; lamellae 

 plane or slightly arcuate in mass, narrow, close, rounded behind, adnexed, white or whitish, 

 becoming dingy or tinged with reddish-brown when old; spores oblong or subfusiform, 10-12 X 

 3.5-4 m; stipe short, nearly equal, solid or stuffed, slightly pruinose at the top, more or less 

 whitish-tomentose at the base, colored like the pileus, 2.5-5 cm. long, 1.5-2 cm. thick. 



Type locality: Vaughns, New York. 



Habitat: In woods. 



Distribution: Known only from the type locality. 



