10 NORTH AMERICAN FLORA [Volume 10 



15. Melanoleuca serratifolia (Peck) Murrill. 



Tricholoma serratifolium Peck, Ann. Rep. N. Y. State Mus. 46: 102. 1894. 



Pileus fleshy, firm, often irregular, convex to subplane, 5-10 cm. broad; surface white, 

 light-brown or yellowish-brown at the center, dry, silky or floccose-squamulose; context white 

 or whitish, taste at first mild becoming acrid; lamellae adnexed, crowded, broad, the edges 

 serrate or erose, white; spores ellipsoid or subglobose, 5-6X5 fi; stipe short, stout, white, solid, 

 2.5 cm. long, 6-12 mm. thick. 



Type locality: Shokan, New York. 

 Habitat: On the ground in woods. 

 Distribution: New York. 



16. Melanoleuca lateraria (Peck) Murrill. 



Agaricus {Tricholoma) laterarius Peck, Bull. Buffalo Soc. Nat. Sri. 1: 43. 1873. 



Pileus convex or nearly plane, sometimes slightly depressed in the center, gregarious to 

 cespitose, 5-12 cm. broad; surface dry, pruinose, white to rosy-isabelline, the disk often tinged 

 With brick-red or brown; margin incurved when young, then marked with slight, subdistant, 

 short, radiating ridges; context white, odor farinaceous, taste bitter; lamellae plane in mass, 

 narrow, crowded, emarginate, decurrent in slight lines, white; spores globose, 4-6 m J stipe 

 nearly equal, solid, white, 5-7.5 cm. long, 6-10 mm. thick. 



Type locality: Worcester, New York. 

 Habitat: On rotten wood or leaf -mold in woods. 

 Distribution: Northeastern United States. 

 Illustration: Hard, Mushrooms/. 47. 



17. Melanoleuca subsaponacea (Peck) Murrill. 



Tricholoma subsaponaceum Peck, Bull. N. Y. State Mus. 157: 35. 1912. 



Pileus fleshy, compact, flexible, convex or nearly plane, 6-14 cm. broad; surface glabrous, 

 whitish, creamy-white, or pallid on the margin, smoky-brown or alutaceous in the center, 

 sometimes marked with a row of pallid or watery spots near the margin, assuming yellow or 

 saffron hues when cut or bruised; context white, becoming concolorous when cut or bruised, 

 odor pleasant like anise, taste farinaceous ; lamellae broad, close, adnexed or nearly free, whitish ; 

 spores broadly ellipsoid or subglobose, 5-6 X 4—5 m ; stipe variable, equal or enlarged at the 

 top or at the base, sometimes compressed, x of ten abruptly narrowed at the base and radicating, 

 silky-fibrillose, solid becoming hollow with age, whitish, becoming concolorous when cut or 

 bruised, 4^5 cm. long, 1.5-3 cm. thick. 



Type locality: Rockville, Indiana. 

 Habitat: Among fallen leaves in woods. 

 Distribution: Massachusetts, New York, and Indiana. 



18. Melanoleuca Robinsoniae Murrill, sp. nov. 



Pileus fleshy, convex to subexpanded, somewhat irregular, cespitose, 4-7 cm. broad; 

 surface smooth, glabrous, dry, white or yellowish, slightly darker at the center, isabelline to 

 fulvous on drying, margin thin, concolorous, inflexed when young ; context firm, white, rather 

 thick at the center; lamellae sinuate with decurrent lines, of medium breadth and distance, 

 firm, white; spores ellipsoid, smooth, hyaline, about 7X5 m; stipe short, rather tough, much 

 enlarged at the base, smooth, white, glabrous, 3-7 cm. long, 1-2.5 cm. thick. 



Type collected on the ground among herbaceous plants at Yellowstone kake, Wyoming, 2300 

 m. elevation, August 9, 1912, Winifred J. Robinson 12. 

 Distribution: Known only from the type locality. 



19. Melanoleuca radicata (Peck) Murrill. 



Tricholoma radicatum Peck, BulU N. Y. State Mus. 67: 22. 1903. 



Pileus fleshy, firm, umbraculiform.or broadly convex, 5-8 cm. broad; surface pale-grayish- 

 brown, darker and tinged with reddish-brown in the center, dry, minutely silky-fibrillose or 

 obscurely fibrillose-squamulose, somewhat shining, cuticle separable, margin thin ; context 

 white, edible, taste disagreeable, losing its unpleasant flavor on cooking ; lamellae emarginate, 



