Oomycete

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Oomycetes
Scientific classification
Kingdom: Protista
Phylum: Heterokontophyta
Class: Oomycetes
Orders

Oomycetes form a distinct phylogenetic lineage of fungus-like microorganisms.

That means they are not actually fungi, although some have filaments as fungi do. They are a group of saprophytic and pathogenic single-celled protists.

The Oomyceta are a class in a huge phylum of eukaryotes called the Heterokontophyta.

They are microscopic organisms which reproduce both sexually and asexually. Oomycetes occupy both saprophytic and pathogenic lifestyles and include some of the most notorious pathogens of plants, causing devastating diseases such as potato blight and sudden oak death.

They are often referred to as water moulds (or moulds), although the water-loving nature which led to that name is not true of most species, which are terrestrial pathogens.