LIFE HISTORIES OF FUNGI 277 
(Fig. 200), resembles Agaricus superficially and is often 
mistaken for it. Amanita always has, at the base of the 
stalk, a cup, which Agaricus lacks. 
269. Description. The body of Agaricus consists of a 
FIG. 200. The deadly amanita, Amanita phalloides. Note the cup at 
the base of the stipe. (Photo by E. M. Kittredge.) 
short fleshy stalk (the stipe), having numerous root-like 
hyphae (rhizomorphs] penetrating the soil from its lower 
end, and bearing at its upper end an umbrella-shaped 
expansion, the pileus. On the under side of the pileus are 
numerous thin lamellae or gills. The stalk and pileus are 
