Only a few algae as well as some protists and endosperm cells have no cell wall.
Some algal groups contain other structural substances than cellulose.
The cell wall of elongating cells is still elastic, a property that is lost in fully differentiated cells. It is therefore distinguished between a primary and a secondary wall. The primary cell wall is laid out during the first division of the cell. It develops normally between the two daughter cells during early telophase. The early stage of the new cell wall is the cell plate, a lamella-like structure in the former equatorial plane of the mitotic apparatus.