=Agaricus ulmarius=
=Pileus:= From three to five inches in diameter.
Color, pale yellow or buff; smooth in young
specimen, fissured, spotted, and leathery at
maturity. Flesh in section white.
=Gills:= Dingy white, becoming tawny at maturity,
extending down the stem.
=Stem:= Various in length, occasionally very short and
attached to side of pileus; generally longer as in
Plate, and "off centre"; white; substance solid.
=Spores:= White.
=Taste:= Suggesting fish when cooked.
=Odor:= Pleasant.
=Habitat:= Trunk of elm or from surfaces of broken
or sawn branches. Often growing in dense masses
covering several square feet.