Pythiaceae is a familyofoomycetes. The family includes serious plant and animal pathogens in the genus Pythium. The family was circumscribed by German mycologist Joseph Schröter in 1893.
| Pythiaceae | |
|---|---|
| |
| Water mould - Phytophthora forms: A: Sporangia. B: Zoospore. C: Chlamydospore. D: Oospore | |
Scientific classification 
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| Domain: | Eukaryota |
| Clade: | Diaphoretickes |
| Clade: | SAR |
| Clade: | Stramenopiles |
| Phylum: | Oomycota |
| Order: | Peronosporales |
| Family: | Pythiaceae J. Schröt., 1893 |
| Type genus | |
| Pythium Pringsh., 1858 | |
| Genera | |
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The sporangia may germinate via a germ tube or by release of motile zoospores, depending on the species and the environmental conditions.
Some Pythium species cause "damping off" diseases in young plants (seedlings).
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