Order Pythiales

Family Pythiaceae J.Schröt.

Genus Cystosiphon Roze & Cornu

• Cystosiphon closterii (De Wild.) M. W. Dick – freshwater; parasite on Clоsterium; rare (Кузнецов, 2003: Lagenidium сlosterii de Wild.).

Genus Lagenidium Schenk

• Lagenidium callinectes Couch – marine, littoral; parasite on Balanus; sporadic; parasite on planktonic crustaceans; rare, sometimes common (Кузнецов, 2003).
• Lagenidium chthamalophilum T. W. Johnson – marine, littoral; parasite the eggs of Balanus; common (Кузнецов, 2003).
• Lagenidium enecans Zopf – freshwater; parasite on diatoms; common (Кузнецов, 2003).
• Lagenidium giganteum Couch – freshwater, brackish-water; parasite, saprotroph on invertebrates; rare (Кузнецов, 2003).
• Lagenidium oophilum Sparrow – freshwater; parasite on rotifers; rare (Кузнецов, 2003).
• Lagenidium pythii Whiffen – freshwater; parasite on Pythium; rare (Кузнецов, 2003).
• Lagenidium rabenhorstii Zopf – freshwater; parasite on filamentous green algae; common (Кузнецов, 2003).

Genus Myzocytium Schenk

• Myzocytium intermedium G. L. Barron – freshwater; parasite on nematodes (Кузнецов, 2003).
• Myzocytium proliferum Schenk – freshwater, brackish-water; parasite on filamentous green algae; common, often dominant (Кузнецов, 2003).

M. proliferum f. marinum Kobayasi & M. Ôkubo – marine, littoral, sublittoral; parasite on Cladophora, Rhizoclonium; common (Кузнецов, 2003).

• Myzocytium zoophthorum Sparrow – brackish-water, freshwater; parasite on rotifers; rare (Кузнецов, 2003).

Genus Phytophthora de Bary

• Phytophthora gonapodyides (H. E. Petersen) Buisman – freshwater; saprotroph on dead plants; rare (Кузнецов, 2003).
• Phytophthora infestans (Moht.) de Bary – coastal; parasite on potatoes; common (Кузнецов, 2003).

Genus Pythium Pringsh.

• Pythium adhaerens Sparrow – freshwater; parasite on filamentous green algae; common (Кузнецов, 2003).
• Pythium aquatile Höhnk – brackish-water; saprotroph on dead animals; common (Кузнецов, 2003).
• Pythium daphnidarum H. E. Petersen – freshwater; saprotroph, parasite on crustaceans; rare (Кузнецов, 2003).
• Pythium debaryanum R. Hesse – freshwater, brackish-water; saprotroph; coastal; parasite on roots of plants; common, everywhere (Кузнецов, 2003).
• Pythium diclinum Tokun. – freshwater, brackish-water; saprotroph, parasite on filamentous green algae; rare (Кузнецов, 2003: Naematosporangium gracile (Schenk) Jacz. and Pythium gracile Schenk).
• Pythium marinum Sparrow – marine, littoral; parasite on Porphyra; sporadic (Кузнецов, 2003).
• Pythium maritinum Höhnk – marine, littoral, sublittoral; saprotroph, parasite on green algae; common (Кузнецов, 2003).
• Pythium middletonii Sparrow – freshwater; saprotroph on dead plants; sporadic (Кузнецов, 2003).
• Pythium monospermum Pringsh. – marine, brackish-water, supralittoral; saprotroph; sporadic (Кузнецов, 2003: Naematosporangium monospermum (Pringsh.) Jacz.).
• Pythium tenue Gobi – freshwater; parasite on filamentous green algae; rare (Кузнецов, 2003).
• Pythium cf. thalassium D. Atkins – marine, littoral, sublittoral; parasite on crab eggs; rare (Кузнецов, 2003).
• Pythium undulatum H. E. Petersen var. littorale Höhnk – marine, littoral; parasite on Zostera; common (Kuznetsov, Vekhov, 2001).

Family Pythiogetonaceae

Genus Pythiogeton Minden

• Pythiogeton utriforme Minden – saprotroph on dead plants; rare (Кузнецов, 2003).

rus:Порядок Pythiales