On the basis of the organisation of the vegetative thallus, the morphology of reproductive structures, the way of spores production and particular life cycle involved the kingdom mycota is classified into following divisions.
It includes the simplest type of fungi. It is also called as Algae-Fungi because most of the characteristics of them are similar to algae like Vaucheria.
They have simple thallus which is unicellular or coenocytic or aseptate filaments.
They reproduce asexually by the formation of zoospores or non-motile spores.
Sexual reproduction is isogamous or heterogamous which takes place by gametangial contact.
The diploid phase is represented by zygote.
Phycomycetes has been classified into subclasses: oomycetes and zygomycetes.
Oomycetes range from a primitive unicellular thallus to a profusely branched filamentous mycelium.
Many members of them are terrestrial and obligate parasites.
Asexually they reproduce by biflagellate zoospores.
Sexual reproduction is oogamy that involves the fusion of male and female gametes to form oospore.
Oospore undergoes meioses to produce haploid biflagellate zoospores.