This form of cell-division is known as simple or direct division.
In other words we have here a process of cell-union before we have the cell-division which follows.
It grows by cell-division, the cell dividing into four, eight, or sixteen parts on a quaternary scale.
It was, however, many years before the details of this “cell-division” were laid bare (see Cell-Division below).
It was, however, many years before the details of the growth and reproduction of the cells (cell-division) became well understood.
In the act of cell-division the nuclei of the resulting cells are formed from the nucleus of the primitive cell.
In some cases of cell-division a remnant of the old nucleus is stated to be visible after the fresh nuclei have appeared.
The type in all these cases is this: A mother-cell produces by cell-division four daughter-cells.
Cell-division with rejuvenescence forms the spores of mosses and higher cryptogams.
The spore produces the small green prothallium by cell-division in the usual way, and this completes the cycle of fern life.