Fig 1 23.— C'o^riJiws lugopus. Two stages in another experiment in which 

 ' a diploid myceUum simultaneously diploidised two haploid mycelia 

 like the two from which it was derived. The beginning of the ex- 

 periment resembled that shown in Fig. 122, except for the fact that 

 the three kinds of mycelia deposited as inocula on the dung-agar 

 plate were, from left to right, as follows : the haploid mycelium No. 1 

 of Table I, {Ab), the diploid mycelium No. 1 x No. 9, (Ab) + {aB) ; 

 and the haploid mycelium No. 9 of Table I, (nB). Upper 

 photograph, made three days after inoculation : the two lateral 

 haploid mvcelia have come into contact with, and have fused hy- 

 phally with, the central diploid mycelium. Already the diploidisation 

 of the two haploid mycelia by the central diploid mycelium is ahnost 

 complete; for clamp -connexions could be observed all around the 

 periphery of the [Ah) myceliiun and part of the way around the 

 periphery of the {aB) mycelium. The central diploid mycelium 

 has grown more vigorously and is fluffier than either of the two 

 haploid mycelia. Lower photograph, made five days after inoc- 

 ulation : clamp-connexions could be seen on all the leadmg radial 

 hyphae of both the {Ab) and the {aB) mycelia, thus mdicatmg that 

 the diploidisation of the two lateral haploid mycelia— their con- 

 version into diploid mycelia (J6) + (aB)— by the central diploid 

 mycelium (Ab) + {aB) had been effected completely. The small very 

 white patch on the right side of the central diploid mycelium is 

 due to the presence of a fruit-body rudiment. Natural size. 



