1. An amphigynous Antheridium always formed with each oogonium

2. As nouns the difference between Antheridium and oogonium is that Antheridium is (botany) an organ producing male gametes called antherozoids, found in bryophytes while oogonium is .

3. A female gametangium with a sterile cellular jacket is called an Archegonium, although, like an oogonium, it produces eggs.

4. Glossary A single-celled oogonium (not a multicellular Archegonium , as found in embryophytes) surrounds the single egg cell; however, the nonmotile female gamete, and oogamous reproduction, are similar to embryophytes.