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Argegonium

Diagram van argegonium anatomie

'n Argegonium (meervoud: argegonieë), van die antieke Grieks αρχη ("begin") en γονος ("nasaat"), is 'n veelsellige struktuur of orgaan van die gametofiet fase van sekere plante wat die ovum of vroulike gameet produseer en bevat. Die argegonium het 'n lang nek en geswolle basis. Argegonieë is tipies geleë op die oppervlak van die plant se tallus, alhoewel dit in die horingblad omsluit is.

Argegonieë is ook baie kleiner en ingesluit in die megagametofiete van gimnosperme. Die term word nie vir angiosperme of die gnetofiete Gnetum en Welwitschia gebruik nie, omdat die megagametofiet verminder is tot slegs 'n paar selle, waarvan een tot 'n eiersel differensieer. Die funksie van die omringende gameet word tot 'n groot mate deur die diploïedselle van die megasporangium (saadkern) binne die saadknoppie aangeneem.

Die ooreenstemmende manlike orgaan word die helmknoppie genoem.

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Argegonium
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