Oomycetes are popularly known as Water molds, they are the single celled and filamentous Heterokonts which physically look like fungi. They reproduce both by sexual and as well as asexual methods. They are microscopic in nature and they are absorptive organisms as well. They have a tube like vegetative body and they are composed of mycelia (also known as thallus).
The name water mold was derived because they were classified amongst the fungi which were found in early days. Their cell walls are composed of cellulose and usually they don’t have any separations. They also have diploid nuclei in the vegetative where on the other hand the fungi have haploid nuclei.
Water molds are related to the organisms like the diatoms and the brown algae, which make their separate group known as Heterokonts. The name is derived due to the common arrangement of structure of the motile cells which usually comprises of two unequal flagella. They Oomycetes are very significantly and scientifically important as they are one of the aggressive pathogens of plants.
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