The endosperm in which nuclear divison is accompanied by cell wall formation is

The endosperm in which nuclear division is accompanied by cell wall formation is Cellular endosperm.
The endosperm is a tissue produced inside the seeds of most flowering plants following double fertilization.
In cellular endosperm formation, cell-wall formation is coincident with nuclear divisions.
In endosperm formation, a cell wall is laid down between the first two nuclei, after which one half develops endosperm along the cellular pattern and the other half along the nuclear pattern.