Chara is a multicellular green alga. Sexual reproduction in Chara is oogamous.The male sex organ is a spherical structure which is yellow in color and is called antheridium or globule.The female sex organ is oval shaped green colored structure and is called oogonium or nucule.Most species of Chara are monoecious i.e. globule and nucule are present on the same plant. Globule and nucule are present at the nodes with globule present below the nucule i.e. oogonium are present at upper portion and antheridium is present at a lower portion.