Sexual reproduction is of isogamous, anisogamous and oogamous type in:

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Chlorophyceae: The sexual reproduction shows considerable variation in the type and formation of sex cells and it may be isogamous, anisogamous or oogamous. Some commonly found green algae are Chlamydomonas, Volvox, Ulothrix, Spirogyra and Chara. Phaeophyceae: Sexual reproduction may be isogamous, anisogamous or oogamous. Union of gametes may take place in water or within the oogonium (oogamous species). The gametes are pyriform (pear-shaped) and bear two laterally attached flagella. The common forms are Ectocarpus