156 RESEARCHES ON FUNGI 



dung-balls, or in one large dung-ball, or in part of a very large dung- 

 ball. For our purpose, in what follows, it will be assumed that a 



Fig. 8G. — Coprinus stcrquilinus. A large fruit-body coming up in a 

 pure horse-dung culture. The pileus is expanding and has just 

 begun to discharge its spores. The fruit-body, in the course of 

 its development, drew upon and exhausted the mycelium in more 

 than one dung-ball. Photographed at Winnipeg. Natural size. 



single fruit-body coynpletely uses up the mycelium in a single dung-ball. 



The development of the mycelium of Coprinus sterquilinus in 



a hanging drop of dung-agar is illustrated diagrammatically in 



