organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Kingdom Protoctista Hogg, 1860
     Phylum Oomycota Arx (1967)
       Class Peronospora see Order Peronosporales
         Genus Albugo (Pers.) Roussel (1806)
         Genus Peronospora Corda (1837)
         Genus Phytophthora de Bary (1876)
         Genus Plasmopara J.Schröt. (1886)
         Genus Pythium Pringsh. (1858), nom. cons.