Classification of Family Pythiaceae in Fungi
Zoosporangia globose to oval, terminal or intercalary and zoosporesare developed by forming a vesicle
Zoosporangia hyaline lemon shaped and sporangium germinated by germ tube or by zoospores but never form vesicle.
E.g.Damping off vegetables-Pythium debaryamum
E.g. Late blight of potato-Phytophthora infestans.