The flagellated pyriform gametes are formed in the brown algae.
Brown algae, or Phaeophyceae, are primarily found in maritime environments. They exhibit a lot of variety in size and shape. They can be as simple as branched, filamentous types (Ectocarpus) or as complex as kelps, which can grow up to 100 metres. They contain carotenoids, xanthophylls, chlorophyll a, and c.
Most brown algae reproduce asexually by producing pear-shaped biflagellate zoospores with two uneven flagella that are laterally connected.
They have isogamous, oogamous or anisogamous sexual reproduction. Gamete union can occur in the oogonium or water (oogamous species). The flagella are linked laterally to the gametes, which are pyriform (pear-shaped). Ectocarpus, Laminaria, Dictyota, Fucus and Sargassum are examples of popular forms.
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