ALGAL AND FUNGAL PROTISTS 



49 



several nuclei. In the conjugants similar nuclei crowd the 

 plasm on each side of the septum, and when the latter has 

 been absorbed some of the nuclei would appear to fuse in 



4 a 



FIG. 11. NUCLEI OF MUCOR. a, end of hypha ; 6, conjugation ; c, 

 \?) fusion of nuclei in zygospore of M. fragilis ; d, resting nucleus with 

 nucleolus and centrosome ; e, part of sporangial membrane with 

 spores ; /, mitosis, metaphase, in M . sylvaticus ; g, anaphase in 

 Phycomyces nitens. a-c after Dangeard, the rest after Moreau. 



pairs ; the remainder disintegrate, All the details have 

 not yet been made clear. 



Some Features of Parasitic Fungi. Spores of some 

 parasitic fungi may go through the first stage of germination 

 if placed in water, but they soon die unless they are brought 

 into contact with their proper host. Such organisms are 

 necessary parasites. The special organs of the simpler 

 parasitic fungi may be considered before passing to examples 

 of more intimate adaptation. 



