| In the club mosses the zygote divides in a plane at right angles to the axis of the archegonium. |
| The axis of the embryo is inclined to that of the archegonium and may be almost at right angles. |
| Spermatozoids are formed in the antheridium, and these enter the archegonium and fertilize the germ cell. |
| In all the Archegoniate fertilization and the first critical phases of embryogeny occur within the shelter provided by the archegonium and the adjacent gametophytic tissue. |
| The archegonium has the form of a narrow flask with a long neck. |
| An archegonium consists of neck cells and a large egg cell. |
