RATE OF MOVEMENT OF NUCLEI 



225 



time which elapsed between the zero hour when the inoculum 

 {AB)+{ab) was set on the plate and the time at which the large 



11 111 



1 c/m 



66 nouA/i 



AB + ab 



Fig 129 ^Coprinus lagopus. The diploidisation of a large haploid mycelium {AB) 

 by a diploid myceliimi {AB) + (ah). The circles Nos. 2-13, originally drawn m 

 blue pencil on the under side of the Petri dish, show the boundary of the 

 mycelium from the end of the second to the end of the thu-teenth day. The 

 (AB) myceliimi was inoculated with a tiny hyphal mass of the {AB)->r{ab) 

 mycelium after nine days of growth (periphery shown by the heavier inner 

 circle, No. 9) at the zero hour. The diploid mycelium diploidised the haploid 

 mycelium in a little more than three days. The crosses indicate where clamp- 

 connexions were observed after 42, 66, and 74 hours, respectively. The (06) 

 nuclei must have travelled (see lower broken line) more than 7-7 cm. or 77 mm. 

 through the {AB) hyphae in about 64 hours, or more than 1 • 2 mm. per hour. 

 Drawn by A. H. R. Buller and Ruth Macrae. Natural size. 



central haploid myceUum and the small excentric diploid mycehum 

 met and fused, the speed of movement of the {ah) nuclei through the 

 {AB) myceUum is increased to 1 -2 mm. per hour. Here, again, for 



VOL. IV. ^ 



