60 | ASSEMBLY 
Pleurotus ulmarius, 77. 
Elm Agaric. 
Agaricus ulmarius, Bull. 
Pilens fleshy, compact, convex or nearly plane, giabrous, moist, some- 
times tinged with reddish, yellowish or brownish hues and marbled 
with livid spots, becoming darker and shining when old, flesh pure ~ 
white ; lamelle broad, emarginate or rounded behind, adnexed, mode- 
rately close, white or whitish ; stem stout, solid, straight or curved, 
glabrous or partly or wholly tomentose, whitish ; spores globose, .0002 
to .00025 in. broad. 
Pileus 3 to 6 in. broad, stem 1 to 3 in. long, 6 to 10 lines thick. 
Trunks of elm trees. Albany and Trenton Falls. September to 
December. Edible. 
Variety acericola. Plant smaller, ceespitose. 
Trunks and roots of maple trees. Adirondack mountains. September. 
Variety populicola. Plant subcespitose, stem wholly tomentose. 
West Albany. 
This is one of our largest Pleuroti. It is variable in size and appear- 
ance. The stem is often thickened either above or below, and it 
may be glabrous or entirely tomentose, or only at the base or apex. 
Sometimes it is longitudinally rimose. On the elms of Albany it 
usually grows from places where branches have been cut away. It 
persists as a conspicuous object for many days. In very wet weather 
the disk is apt to crack either in a radiate or reticulate manner, . 
Pleurotus sulphureoides, P/. 
Pale-yellow Agaric. 
Pileus fleshy, rather thin, convex, umbonate, glabrous or slightly — 
squamulose, pale-yellow ; lamellz moderately close, rather broad, 
slightly emarginate or rounded behind, pale-yellow ; stem firm, equal, 
slightly fibrillose, stuffed or hollow, generally curved and eccentric, 
rarely central, slightly mealy or tomentose at the top, yellowish or 
pallid; spores elliptical, .0003 to .00035 in. long .0002 to .00025 broad. 
Pileus 1 to 2 in. broad, stem 1 to 1.5 in, high, 2 to 3 lines thick. 
Decaying prostrate trunks. Catskill mountains, October. Rare. 
This species has not been detected since its discovery. It becomes 
paler in drying. The minute scales are brown, but sometimes are 
wanting. I have separated this Agaric from A. sulphwreus because of 
its eccentric stem, woody habitat and squamulose pileus, 
Pleurotus lgnatilis, 7. 
Wood-inhabiting Agaric. 
Agaricus abscondens, Pk. 
Pilens compact, convex, sometimes slightly depressed or umbilicate, 
flocculose-pruinose or glabrous, white ; lamella thin, narrow, crowded, 
emarginate or adnate, white ; stem unequal, rather slender, curved, | 
stuffed or hollow, whitish, sometimes tomentose at the base; spores. 
minute, elliptical, 00016 to 0002 in, long, usually with a shining 
nucleus; odor distinct, farinaceous. 
