The sex organs in bryophytes are multicellular and protected by a sterile jacket of cells. This jacket layer is an evolutionary adaptation that protects the developing gametes from desiccation (drying out) as bryophytes are terrestrial plants.

Male sex organ: Called the antheridium, it is typically stalked and produces biflagellate antherozoids.

Female sex organ: Called the archegonium, it is flask-shaped and contains a single egg.

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