The kingdom Oomycota includes a number of fungus-like groups such as the downy mildews and white rusts. They produce similar threads called hyphae and secrete enzymes to digest their food before absorbing the released nutrients. They differ from fungi in that their cell walls are made of cellulose rather than chitin. Phytopthera is responsible for blight in potatoes and Pythium causes the damping-off of seedlings.
Illustrated article on the structure and behavior of the motile flagellate spores of the economically important Oomycota.
Overview of the water molds and downy mildews with links and images.
Illustrated outline of the classification and economic significance of the Chytridiomycota and Oomycota.
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