After Parker, 1982, and Adl et al., 2005

<==o Chytridiomycota de Berry, 1863, emend. Sparrow, 1958, emend. Cavalier-Smith, 1981 [Chytridiomycetes] (vesihomeet; water molds, Allomyces, etc.)
   |--o Neocallimastigaceae Li, Heath & Packer, 1993
   |  |-- Anaeromyces
   |  |-- Caecomyces
   |  |-- Cyllamyces
   |  |-- Neocallimastix
   |  |-- Orpinomyces
   |  `-- Piromyces
   |--o Chytridiales Cohn, 1879, emend. Barr, 2001
   |  |?- Allochytridium
   |  |?- Asterophlyctis
   |  |?- Catenochytridium
   |  |?- Chytriomyces
   |  |?- Endochytrium
   |  |?- Entophlyctis
   |  |?- Lacustromyces
   |  |?- Nephrochytrium
   |  |?- Nowakowskiella
   |  |?- Obelidium
   |  |?- Phylctorhiza
   |  |?- Physocladia
   |  |?- Podochytrium
   |  |?- Polychytrium
   |  |?- Polyphagus
   |  |?- Polyphagus
   |  |?- Rhizoclosmatium
   |  |?- Rhizophydium
   |  |?- Septochytrium
   |  |?- Synchytrium
   |  |--o Inoperculatae
   |  |  |-- Achlyogetonaceae
   |  |  |-- Synchytriaceae
   |  |  |-- Phlyctidiaceae
   |  |  |-- Rhizidiaceae
   |  |  `--o Cladochytriaceae
   |  |     `-- Cladochytrium
   |  `--o Operculatae
   |     |--o Chytridiaceae
   |     |  `-- Chytridium
   |     `-- Megachytriaceae
   |--o Blastocladiales Petersen, 1909
   |  |-- Sorochytrium Dewel, 1985 [Sorochytriaceae Dewel, 1985]
   |  |--o Coelomomycetaceae Couch, 1945
   |  |  `-- Coelomomyces
   |  |--o Catenariaceae Couch, 1945
   |  |  |-- Catenomyces
   |  |  |-- Catenophlyctis
   |  |  `-- Caternaria
   |  |--o Physodermataceae Sparrow, 1952 []
   |  |  |-- Physoderma
   |  |  `-- Urophlyctis
   |  `--o Blastocladiaceae Petersen, 1909 [treated as inoperculate Chytridial by Parker (1982)]
   |     |-- Allomyces
   |     |-- Blastocladia
   |     |-- Blastocladiella
   |     |-- Blastocladiopsis
   |     `-- Microallomyces
   |--o Monoblepharidales Schröter, 1893, emend. Barr, 2001
   |  |--o Gonapodyaceae Sparrow, 1960
   |  |  `-- Gonopodya
   |  |--o Monoblepharidaceae Fischer, 1892, emend. Mollicone & Longcore, 1999
   |  |  |-- Monoblepharella
   |  |  `-- Monoblepharis
   |  `--o Oedogoniomycetaceae Barr, 1990
   |     |?- Harpochytrium
   |     `-- Oedogoniomyces
   `--o Spizellomycetales Barr, 1990
      |--o Spizellomycetaceae Barr, 1980
      |  |-- Gaertneriomyces
      |  |-- Karlingiomyces
      |  |-- Kochiomyces
      |  |-- Spizellomyces
      |  `-- Triparticular
      `--o Olpidiaceae Schröder, 1889 [treated as inoperculate Chytridial by Parker (1982)]
         |-- Caulochytrium
         |-- Entophlyctis
         |-- Olpidium
         |-- Rhizophlyctis
         `-- Rozella

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