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Oogonium
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An oogonium is a small diploid cell which, upon maturation, forms a primordial follicle in a female fetus or the female gametangium of certain thallophytes.
A Thalassiosira pseudonana diatom oogonium beginning to expand through the cell wall. Artificial coloring denotes chlorophyll (blue) and DNA (red).
A Thalassiosira pseudonana diatom oogonium beginning to expand through the cell wall. Artificial coloring denotes chlorophyll (blue) and DNA (red).
Oomycete
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The oomycetes, or Oomycota, form a distinct phylogenetic lineage of fungus-like eukaryotic microorganisms within the Stramenopiles. They are filamentous and heterotrophic, and can reproduce both sexua
Oogonium
…oogonium refers to a female gametangium if the union of the male (motile or non-motile) and the female gamete takes place within this structure. In Oomycota and some other organisms, the female oogonia, and the male equivalent antheridia, are a result of sexual sporulation, i.e. the development of structures…
Sexual structures (only oogonia, antheridia not shown) of Saprolegnia.[citation needed]
Sexual structures (only oogonia, antheridia not shown) of Saprolegnia.[citation needed]
Pythium sp. (Peronosporales), which causes pythiosis in animals, under microscope.
Pythium sp. (Peronosporales), which causes pythiosis in animals, under microscope.
Symptom of late blight (P. infestans, Peronosporales) on the underside of a potato leaf.
Symptom of late blight (P. infestans, Peronosporales) on the underside of a potato leaf.
Albugo candida (Albuginales) on shepherd's purse (Capsella bursa-pastoris, Brassicales).
Albugo candida (Albuginales) on shepherd's purse (Capsella bursa-pastoris, Brassicales).