72 
Mycologia 
Fig. B. Outer surface of an infected host showing the junction of the 
pileus and the thickened veil. 
Fig. C. Young carpophore of Coprimis atramentarius unaffected by the 
parasite. 
Fig. D. Vertical section showing the position of the gills when the pileus 
begins to expand. 
Fig. E. Section of a young carpophore of Agaricus arvensis showing the 
position of the gill chambers. 
Fig. F. Section of a somewhat older carpophore in the growing state, 
showing the lines of growth, position of the gills and the partial veil when 
the stem begins to elongate. 
