OOMYCETES 



53 



have fertilization by sperms, while in the Blastocladiaceae the sexual 

 organs are still unknown. 



In the biflagellate forms, there are three families: the Ancylistaceae, 

 the Saprolegniaceae and the Peronosporaceae. The Ancylistaceae are 



OOMYCETES 



PEROXOSPORAOEAE 



Albugineae 

 Albugo 



I Peronosporeae 



j Peronospora 



I Bremia 



i Plasmopara 



! Sclerospora 



j Basidiophora 



Pythieae 



Phytophthora 

 Pythium 

 Pythiomorpha 

 Pythiogeton 



SAPROLEGNIACEAE 



Aplanes 



Pythiopsis 



Thraustotheca 

 Dictyuchus 



Achlya 

 Isoachlva 



/. * 



Saprolegnia 



LEPTOMITEAE 



Ara iospora 

 Rhipidium 

 Leptomitus Apodachlya 



ANCYLISTACEAE 

 Ertrogella 

 Myzocytium 

 Lagenidiuni 

 Anevlistes 



BLASTOCLADIACEAE 



Jaraia? 

 Allomyces 

 Blastocladia 

 Gonapodya 



MOXOBLEPHARIDACEAE 



Monoblepharis 



Diblepharis 



Myrioblepharis 



t 

 CHLOROPHYCEAE 



Diagram VI. 



aquatic and parasitic on lower plants and animals, their thallus is reduced 

 and limited to the formation of the reproductive organs. At least in 

 Ancylistes the contents of the oogonium changes into a single egg cell. 



