Murrill: Agaricaceae of Pacific Coast 
207 
strongly suggests Tricholoma album, hence the specific name se- 
lected for it. 
Clitocybe atrialba sp. nov. 
Pileus convex to slightly depressed and at length infundibuli- 
form, regular in outline, solitary or gregarious, reaching 6 cm. 
broad ; surface at first smooth, glabrous, dry, fuliginous-ater, be- 
coming finely imbricate from the breaking up of the cuticle; mar- 
gin entire, concolorous, strongly inflexed on drying; context thin, 
white, tough, with mild flavor; lamellae decurrent, not crowded, 
white, becoming grayish-discolored ; spores globose to subglo- 
bose, smooth, hyaline, granular, 8.5-10 X 7-8 ; stipe equal or 
slightly tapering upward, flattened or twisted at times, dry, 
furfuraceous or finely scabrous, avellaneous, hollow, with rather 
tough rind, 5-10 cm. long, 6-10 mm. thick. 
Type collected on decayed buried wood in the woods near 
Seattle, Washington, October 20-November i, 1911, W. A. Mur- 
rill Also collected in the same locality, W. A. Murrill 24P, 
and on decayed buried wood at La Honda, near Palo Alto, Cali- 
fornia, November 25, 1911, IV. A. Murrill & L. R. Abrams 126^. 
This species is rather tough for Clitocybe, somewhat resembling 
Collybia platyphylla. It is characterized by its dark-brown cap, 
white gills, and concolorous, furfuraceous stipe. The spores are 
also very characteristic in size and appearance. 
Clitocybe avellaneialba sp. nov. 
Pileus large, thin, slightly umbonate, becoming infundibuliform, 
gregarious to cespitose, reaching 10 cm. or more broad ; surface 
hygrophanous, avellaneous to dark-fuliginous, subzonate, innate- 
radiate-fibrillose, hispid-fibrillose in the center, margin entire, 
concolorous ; context thin, white, of mild flavor ; lamellae short- 
decurrent, rather close and narrow, white ; spores globose, smooth 
hyaline, 7-8 X 5 ; stipe tapering upward, whitish-mycelioid at the 
base, avellaneous, finely fibrillose to glabrous, solid or hollow with 
a tough rind, reaching 10 or more cm. long and i cm. thick. 
Type collected in humus on the ground in woods near Seattle, 
Washington, October 20-November i, 1911, W. A. Murrill 526. 
Also collected in humus uwder a log in woods near Seattle, Wash- 
ington, October 20-November i, 1911, IV. A. Murrill 2 Qj; and 
among leaves and sticks under redwoods near Searsville Lake, 
California, January 6, 1903, James McMurphy 2. This species 
