ALGAL AND FUNGAL PROTESTS 



43 



The greater the number of nuclei that remain in the 

 ovum of any species, the smaller is the coenocentre. 



Equivalence of a germ-hypha to a brood of Zoospores 

 in Phycomycetes. An instance of the equality of germ- 

 hypha and zoospore has been mentioned above : the first 



FIG. 8. CYSTOPUS CANDIDUS. a, end of a hypha with 4 branches (conidi- 

 ophores) ; 6, germination of a conidium ; c, zoospores ; d, germination 

 of zoospores ; e, end of antheridium attached to /, the oogonium. the 

 fertilisation -canal is formed, p, periplasm ; g germination of oospore ; 

 h, zoospores ; i t part of an early oogonium, showing in the middle 

 the darkly stained coenocentre and near it 4 mitoses, farther out, 

 small nuclei, a-h, after de Bary ; i, modified from Stevens. 



alga-like form of zoospore of Saprolegnia secretes a capsule 

 from which either a kidney-shaped zoospore or a germ- 

 hypha may be produced ; and in Pythium a germ-hypha 

 may be alternative to a zoosporange. A similar alternative 

 is found in Phytophthora, the conidia of which in water pro- 

 duce a group of zoospores, but in nutrient media a simple 

 germ-hypha. 



