Melanoleuca platyphylla Murrill 1913

Melanoleuca platyphylla Murrill, Mycologia 5: 219. 1913
Tricholoma platyphyllum Murrill, Mycologia 5: 223. 1913.
Pileus convex to slightly depressed, rather thick, solitary, 3.5 cm. broad; surface smoot^, subglabrous, white with a cremeous tint, margin entire, concolorous ; lamellae white, subdistant, ventricose, very broad; spores ellipsoid, smooth, hyaline, granular, 8.5 X 6 ju; stipe tapering upward from a swollen base, pure-white, smooth, glabrous, 8 cm. long, 5-9 mm. thick.
Type locality: Seattle, Washington.
Habitat: In humus in woods.
Distribution: Known only from the type locality.