After fertilisation, the immature sporophyte pushes its way out of the archegonial venter. |
The cytological features of the cells taking part in archegonial development and oogenesis in the fern Plagiogyrio euphlehia Mett. |
The capsule and operculum are in turn sheathed by a haploid calyptra which is the remains of the archegonial venter. |
It may have been missed because the correct stage of archegonial development was not sectioned. |
The newly formed egg is closely appressed to the archegonial jacket cells. |