WHITE-SPORED AGARICS. 103 



because it is often found growing on dead elm branches or trunks, or 

 from wounds in living trees, but it is not confined to the elm. It is a 

 large species, easily distinguished from the oyster agaric and the 

 other related species by its long stem attached usually near the center 

 of the cap, and by the gills being rounded or notched at their inner 



Figure io6. Pleurotus ulmarius. Under view and section (natural size). 



Copyright. 



extremity. The cap is 5-12 cm. broad, the stem 5-10 cm. long, and 

 1-2 cm. in thickness. 



The pileus is convex, the margin incurved, then nearly expanded, 

 smooth, firm, white or whitish, or with shades of yellow or brown on 

 the center, and the flesh is white. The gills are broad, rather distant. 



