Oogon

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Antheridium (red) and Oogon (right next to it) of the candelabrum Chara contraria

As oogone or Oogonium , in some algae and fungi , the immovable ovum (the oosphere) designated by their envelope. ( Oogonium ; from the Greek oon = egg and gone = offspring; in German: egg bud .)

The oogon is a gametangium . Other types of gametangia differ from the oogon in the sex of the gametes (germ cells) or in that the sex cells leave the gametangium after they have matured.

In many fungi the male gametes do not leave their gametangia either, but male gametangia and oogonia grow towards one another and thus mate.

In candelabrum algae , the oogon is surrounded by a layer of enveloping cells , the sporostegium , that runs in a clockwise direction . This forms a crown at the top, in the middle of which the male spermatozoids from the neighboring antheridia (male gametangium) can reach the female egg cells through a thin channel .

In zoology, the female germ line cells in the mitotic reproduction phase are called oogonia (compare: oogenesis ).