| Since the asexual gametophyte does not form antheridia or archegonia, crosses to confirm its genotype could not be performed. |
| The archegonia have a shorter neck than those of the ferns, and the neck is straight. |
| This is a new feature and contrasts with most free-sporing plants in which sperm, rather than the whole microgametophyte, move to the archegonia. |
| Notwithstanding their general similarity, the archegonia of mosses differ externally from antheridia in having a longer neck and longer stalk. |
| The grain is empty because the body cell and prothallial nuclei have moved out along the pollen tube towards the archegonia. |
| Antheridia formed on the dorsal and ventral surfaces of the wing, while archegonia formed on the ventral surface of the anterior cushion. |
