| Notwithstanding their general similarity, the archegonia of mosses differ externally from antheridia in having a longer neck and longer stalk. |
| Each antheridial chamber incorporates several antheridia, all of which are developed from one antheridial initial. |
| Other aberrant gametophyte phenotypes were observed among the group of mutants that could form antheridia. |
| Meiosis occurs just before mating in well-differentiated oogonia and antheridia. |
| In the rotting tissues branches of the older mycelium similarly swell up and form antheridia and oogonia. |
| Since the asexual gametophyte does not form antheridia or archegonia, crosses to confirm its genotype could not be performed. |
