PLATE 13 
Agaricus tabularis: 
A. —Two fruiting rings showing large fruiting bodies about 15 cm. in diameter and 
of relatively uniform size. Akron, Colo., June 7, 1909. 
B. —A ring just after the fruiting period. The area in the ring is distinguished by 
dead short grass with small plants of Plantago purshii and Festuca octojlora and unusu¬ 
ally luxuriant plants of Artemisia frigida, the roots of which penetrate below the dry 
soil layer of the ring. The inside of the ring is marked by the abundance of annuals, 
of which P. purshii is the most prominent and abundant. Akron, Colo., June 25,1915. 
