Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Clade neomura Cavalier-Smith, 1987
             Domain Eukaryota Chatton, 1925 - eukaryotes
               Clade discaria Cavalier-Smith, 2021
                 Clade natates Cavalier-Smith, 2021
                   Clade photaria Cavalier-Smith, 2021
                     Clade eucorta Cavalier-Smith, 2021
                       Superkingdom Corticata Lankester, 1878 - corticates
                         Kingdom Chromista Caval.-Sm. (1981) - chromists
                           Subkingdom Harosa Cavalier-Smith, 2010
                             [crown] Clade Sar Adl et al. 2012 [Simpson & Dunthorn 2020]
                               Infrakingdom Halvaria Cavalier-Smith, 2010
                                 Superphylum Heterokonta Caval.-Sm. (1986)
                                   Phylum Oomycota Arx (1967)
                                     Class Peronosporea
                                       Subclass Peronosporidaeᵀ
                                         Order Pythiales
                                           Family Pythiaceaeᵀ
                                             Genus Pythiumᵀ Pringsh. (1858), nom. cons.
                                               Pythium chondricola De Cock (1986)
                                               Pythium debaryanum R. Hesse (1874)
                                               Pythium diclinum Tokunaga
                                               Pythium graminicola Subramanium (1928)
                                               Pythium inflatum V.D. Matthews (1931)
                                               Pythium insidiosum De Cock, L. Mend., A.A. Padhye, Ajello & Kaufman (1987)
                                               Pythium mammillatum
                                               Pythium monospermum Pringsheim
                                               Pythium porphyrae Takahashi & Sasaki
                                               Pythium sulcatum R.G. Pratt & J.E. Mitchell (1973)