34 



COMPARATIVE MORPHOLOGY OF FUNGI 



Lagerheim (1893), Kusano (1912) and Griggs (1912) suggest a deriva- 

 tion from algae, especially the Phyllobieae, by adaptation to parasitism. 

 Lotsy (1907) and Vuillemin (1907) consider the biflagellate forms at 

 least, are derived from the Isokonteae, while the uniflagellate forms 

 were much simpler and not related to the former. Dangeard, A. Fischer, 

 Cavers and Scherffel finally emphasize their relationship with the Proto- 

 zoa, especially with the Monadineae (Pseudosporeae) e.g., Aphelidium 

 and Aphelidiopsis. It is possible that the Chytridiales include entirely 

 heterogeneous elements which appear to converge because of the leveling 

 influences of aquatic and parasitic habits. 



CHYTRIDIALES 



HYPHOCHYTRIACEAE 



Macrochytrium 



CLADOCHYTRIACEAE. 



Urophlyctis 



Physoderma 



Nowakowskiella 



Cladochytriu'm 



Amoebochytrium 



RHIZIDIACEAE 



Chytridieae 



Chytridium 

 Dangeardia 



Entophlycteae 



Pseudolpidiopsis? 

 Diplophlyctis 



Rhizophideae 



Zygorhizidium? 

 Rhizidiomyces 

 Rhizophidium 

 Phlvctidium 



Rhizidieae 



Polyphagus 



Sporophlyctis 



Rhizophlyctis 



Saccomyces 



Rhizidium 



Harpochytrieae 

 Harpochytrium 



CHLOROPHYCEAE 



Diagram IV. 



