Starting in the centre of the diagram, the processes involved are: An immobile egg, contained in the archegonium, fuses with a mobile sperm, released from an antheridium.
Comezando desde o centro do diagrama, os procesos implicados son: Un ovo inmóbil, contido no arquegonio, fusiónase cun espermatozoide móbil, liberado dun anteridio.