A class of fungus-like organisms (see fungi) in most species with cell walls containing cellulose rather than chitin (as in fungi). They are single-celled, filamentous, and reproduce both sexually and asexually. Their motile cells have two flagella, one of the whiplash type and one of the tinsel type. Some oomycetes are serious pathogens of plants and others infect fish. The serious plant pathogens include Phytophthora, the genus that causes dieback, sudden oak death, and late blight of potato. There are four orders.
Subjects: Ecology and Conservation.