60 [Assembly 



Pleurotus ulmarius, Fr. 



Elm Agaric. 

 Agaricus ulmarius, Bull. 



Pileus fleshy, compact, couvex or nearly plane, glabrous, moist, some- 

 times tinged with reddish, yellowish or browniali hues and marbled 

 with livid spots, becoming darker and shining when old, flesh pure 

 white ; lamellce broad, emarginate or rounded behind, adnexed, mode- 

 rately close, toliite or zuliitish ; 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, caespitose. 



Trunks and roots of maple trees. Adirondack mountains.. September. 



Variety populicola. Plant subcaespitose, 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, Ph. 

 Pale-yellow Agaric. 



Pileus fleshy, rather thin, convex, umbonate, glabrous or slightly 

 squamulose, pale-yelloio ; lamella3 moderately close, rather broad, 

 slightly emarginate or rounded behind, pale-yelloio ; stem linn, equal, 

 slightly fibrillose, stuffed or Jiolloio, 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 broAvn, but sometimes are 

 wanting. I have separated this Agaric from A. sulphureus because of 

 its eccentric stem, woody habitat and squamulose pileus. 



Pleurotus lignatilis, Fr. 



Wood-inhabiting Agaric. 



Agaricus abscondens, Pk. 



Pileus compact, convex, sometimes slightly depressed or umbilicate, 



flocculose-pruinose or glabrous, ?/;/ijYe ; lamella thin, narrow, croivdcd, 



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. 



