PLATE 15 
Agaricus tabularis: 
A. —A trench across a fairy ring. This reproduction of a photograph which was 
taken after a rather heavy rain shows the dry soil area (light-colored) in the ring and 
extending back inside the ring. The darker soil above is freer from mycelium, while 
the light soil is filled with a dense growth of mycelium. In the foreground the moisture 
has penetrated around the end of the mycelium and back underneath, showing dis¬ 
tinctly the difficulty with which the dry soil filled with mycelium is wetted. The 
mycelium comes to within 2 or 3 inches of the surface of the soil, and is usually about 
1 foot in advance of the fruiting bodies. Akron, Colo., August 2, 1915. 
B. —Another trench showing a different distribution of the mycelium in the soil. 
Akron, Colo., August 2, 1915. 
