122 



RESEARCHES ON FUNGI 



B 



Fig. 69. — Coprinus sterquiliiius. Heliotropic and geotropic reactions of a fruit-bodj- 

 exposed to iiiiilateral illumination. Culture medium, sterilised liorse-dung 

 balls. A, the arrows indicate the general direction of the light to which the 

 fruit-body was exposed during its development. B, a very young fruit-body, 

 placed so that it is turned away from the light at an angle of 16" with the 



