PLATE 27 
A. —Three stages in the ripening of sporophores of Calvatia cyathiformis . The 
fruiting body at the left has just formed, and the flesh is still white and in good condi¬ 
tion to eat. The peridium is already strongly marked. The fruiting body at the right 
is at least 2 days older, and the peridium is breaking off in rather thin plates. In 
the center is a still older fruiting body from the upper part of which the peridium has 
blown away, exposing the spore mass. The diameter of largest fruiting body is 15 cm. 
B. —Effect of a ring of C. cyathiformis on the density of the short-grass sod. The 
area behind the short stakes is in the stimulated zone, while that in the foreground is 
in the natural sod. The effect here has been to thicken the sod cover. Akron, Colo., 
June 10, 1916. 
C. —Three fruiting bodies of Lepiota morganii in place in the fairy ring shown in 
Plate 22B, and sketched in figure 7, and two fruiting bodies inverted. These fruiting 
bodies are from 12 to 20 cm. in diameter. 
