Fig. 119. — Coprinus lagopus. Method of mating two mycelia of equal 

 size. A small Petri dish containing cleared dmig-agar was inoculated 

 with two pieces of dung-agar, one on the left containing the haploid 

 mycelium (aB) and the other on the right containing the haploid 

 mycelium (Ab). The upper photograph shows the two mycelia two 

 days after the plate was inoculated ; the mycelia have not yet met 

 and both are haploid (c/. Figs. 112 and 116). The lower photograph 

 shows the same two mycelia six days after the plate was inoculated ; 

 the two mycelia have met, have fused together hyphally, and have 

 < ompletely diploidised one another, so that all the leading radial 

 hyphae now bear clamp-connexions (c/. Fig. 118) and the production 

 of oidia has ceased. The darkness of the centres of the two original 

 haploid mycelia is due to the surface hyphae there having become 

 largely or wholly immersed in water excreted by the very nimaerous 

 oidiophores produced before the two mycelia met and diploidised one 

 another (c/. Fig. 111). The two originally haploid mycelia, having 

 now become diploidised, both have the sexual constitution {Ab)-\-{aB). 

 Natural size. 



