An oidium (plural: oidia) is an asexually produced fungal

spore In biology, a spore is a unit of sexual or asexual reproduction that may be adapted for dispersal and for survival, often for extended periods of time, in unfavourable conditions. Spores form part of the life cycles of many plants, algae, ...

that (in contrast to

conidia A conidium ( ; ), sometimes termed an asexual chlamydospore or chlamydoconidium (), is an asexual, non- motile spore of a fungus. The word ''conidium'' comes from the Ancient Greek word for dust, ('). They are also called mitospores due to t ...

) is presumed not to constitute the main reproductive preoccupation of the fungus at that time. The hypha breaks up into component cells/ small pieces and develop into spores. Oidia cannot survive in unfavourable conditions.

References

Illinois Mycological Association The Illinois Mycological Association or IMA is a group of mushroom enthusiasts, citizen scientists, foragers, and professional mycologists based in the Chicago area. Meetings are held monthly, except in some winter months, at the Niles Histori ...

glossar

Fungal morphology and anatomy {{Mycology-stub pt:Oídio