Explanation of Figures. 
Figure 1 and 2. Mature plants. Fig. 3. Young plant with scurfy exoperi- 
dium. Fig. 4. Obovate form with plicate base from W. H. Aiken, Michigan. Fig. 
5, Obovate form from F. K. Vreeland, Maine. Fig. 6. Capillitium (x 80). Fig. 
7. Spores (x 1000). 
BOVISTA PILA. 
