1) Fungus order 2) Order peronosporales 
The Peronosporales are an order of water moulds (Class Oomycetes) which can be pathogenic. Many diseases of plants are sometimes classified under this order, but are sometimes considered members of order Pythiales. Some of these pathogenic protists include the organisms responsible for potato blight, eucalyptus dieback, sudden oak death, and blue ...
Specialized forms of the Oomycetes, including aquatic and terrestrial species; many species in this order are plant pathogens (damping-off fungi, downy mildews, and white rusts); unlike the true fungi, they lack chitin in their cell walls. 
[n] - order of chiefly parasitic lower fungi: Albuginaceae and Peronosporaceae and Pythiaceae
order Peronosporales noun order of chiefly parasitic lower fungi: Albuginaceae and Peronosporaceae and Pythiaceae