Pythiales

Pythiales
Scientific classification
(unranked):	SAR
Superphylum:	Heterokonta
Class:	Oomycetes
Subclass:	Incertae sedis
Order:	Pythiales

Pythiales is an order of water-molds (oomycetes). Some species of this order are the causative agents of several economically important plant diseases, such as potato blight.

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Wikipedia