192 RESEARCHES ON FUNGI 



Coprinus fimetarius. In 1920, when work on sex in the Hymeno- 



FiG. 109. — Coprinus lagopus, a heterothallic Hymenomycete. 

 Two fruit-bodies grown imder normal conditions of daylight. 

 The smaller fruit-body came up spontaneously on unsteri- 

 lised horse dimg in the laboratory at Winnipeg, while the 

 large one developed in a pure culture (made with spores of 

 Winnipeg origin) on horse dung. In both fruit-bodies, the 

 pilei are grey, owing to the black spores upon the gills. 

 The left-hand one, which is beginning to expand, has not yet 

 begun to shed spores. The right-hand one has already shed 

 a great many spores, some of which have settled upon and 

 have blackened the middle part of the stipe. Natural size. 



mycetes was begun at Winnipeg, I was uncertain whether or not 



