276 STRUCTURE AND LIFE HISTORIES 
outer surface, and the countless numbers of aciospores 
are carried by the wind to nearby wheat, where they, in 
turn, germinate, and the complicated series of events 
begins again. 
267. Diagram of Life History. The life history of 
Puccinia graminis may be outlined as shown on page 275. 
A FLESHY FUNGUS (AGARICUS) 
268. Habitat. Fleshy fungi are found widely dis- 
tributed, growing in the soil of fields, pastures, and 
FIG. 199 Meadow mushroom (Agaricus campcslris L.). A, view 
showing under side of pileus; g, gills; a, annulus, or remains of the veil 
attached to the stipe; B, side view; s, stipe; a, annulus; p, margin of pileus, 
showing at intervals the remains of the veil. (After W. A. Murrill.) 
woods, or on tree trunks, decaying logs, and elsewhere. 
The familiar edible mushroom (Agaricus campestris), 
as its name implies, grows commonly in meadows, and 
is hence often called the "meadow mushroom" (Fig. 199). 
One of the most poisonous species, Amanita phalloides, 
