Oidium

• Oidia are hyaline, small and thin-walled unicellular sections or fragments of the mycelium. • Oidia may be uni- or binucleate as whether they are produced by the breaking up of the primary or secondary mycelium.

However, in some forms mainly some Hymenomycetes it occurs by the formation of oidia. The oidia are of two main types.

Later the pods become covered completely with white powdery mass composed of mycelium, oidiophores and oidia of the fungus.