Because of their motile zoospores, oomycetes commonly require water for reproduction and are often encountered in water or wet soil. After a few days the oomycetes with form a thick white growth around the seeds. If you watch there carefully you may be able to observe the release of zoospores. As their name implies, these fungi all produce zygospores. They resemble the oomycetes in having hyphae that usually lack cross-walls or septa, but differ in lacking motile spores.
Asexual reproduction is by sporangia or conidia.
The members of this group are usually terrestrial and will be encountered only occasionally in aquatic conditions. Zygomycetes are easy to observe. They will invariably grow if soil is sprinkled over strawberries or raspberries. All ascomycetes have ascospores borne inside asci. The hyphae always bear numerous septa.