210 RESEARCHES ON FUNGI 



The three pieces of inocula grew well, and the central diploid 

 mycelium soon came into contact with both of the haploid 



mycelia. 



At the end of three days after the experiment had been set up, 

 the (AB) mycehum exhibited clamp-connexions all around its 



Fig. 122. — Coprinus- lagopus. The beginning of an e.xperiment in which 

 a diploid mycehum simultaneously diploidised two haploid mycelia 

 like tlie two from which it was derived. The photograph shows a 

 small Petri dish containing dung-agar, on the surface of which have 

 just been deposited in a row three small pieces of dung-agar contain- 

 ing, from left to right respectively, the following three kinds of 

 mycelia : the haploid myceliimi No. 5, (o6) ; the diploid mycelium 

 No. 10 X No. 5, {AB) + {ab) ; and the haploid mycelium No. 10, (AB). 

 The mycelia grew out into the dung-agar in the Petri dish and the 

 central diploid mycelium, {AB)-{'(ab), soon diploidised both of the 

 lateral haploid mycelia. (ah) and {AB). Natural size. 



periphery and the {ab) mycelium clamp-connexions part of the way 

 around its periphery ; and, at the end of four days, both of the 

 haploid myceha had become entirely converted into diploid 

 mycelia (c/. Fig. 123). This experiment was repeated and, again, 

 both of the haploid mycelia were rapidly converted into diploid 

 mycelia. 



From the results of the experiments described under (1), (2), 

 and (3) combined with the results of the experiments just recorded, 

 we may conclude that a diploid mycelium {AB)-{-{ah) is able to 

 convert both of the haploid myceha [AB) and {ab) into diploid 



