i66 



RESEARCHES ON FUNGI 



Fig. 93. — Coprinus stercorarius. To show the origin of a fruit-body from a single 

 cell of the mycelium. The species is homothallic, so that each young mono- 

 sporous mycelium soon passes, without union with any other mycelium, from 

 the haploid to the diploid phase. A : part of a diploid mycelium derived from 

 a single spore, growing in a dung decoction, now giving rise to fruit-bodies ; two 

 of these fruit-bodies which are very young but already have the pileus well 

 differentiated are represented ; eacli of the fruit-bodies has arisen from a single 

 diploid cell. B : part of a leading radial hypha of a mycelium like that shown at 

 A ; it is divided into cells by three septa, each of whicli is provided with a clamp- 

 connexion (the clamp-connexion of the middle septiim presumably is hidden) ; 

 one of the two entire cells represented, near one of its ends, has given rise to a 

 fruit-body rudiment which consists of a cluster of several irregular hyphae. C : 

 the same as B, but less highly magnified and with the fruit-body rudiment in a 



