DESCRIPTION OF PLATE XVIII 
COMMON EARTH-BALLS 
i, Scleroderma aurantium ( = Scleroderma vulgare in English textbooks), 
showing the thick, rigid, scaly peridium. 2, Ditto, showing the sub- 
sessile stem. 3, Scleroderma verrucosum , mature plant showing the 
minutely warted peridium and the thick pronounced stem. (All 
natural size, after Lloyd.) 
