. Plant anatomy from the standpoint of the development and functions of the tissues, and handbook of micro-technic. FIG. 6.—Various stages of cell multiplicationby budding of Saccharomyces cerevisias. (AfterReess.) The kind of nuclear division above described is called indirect,mitotic, or karyokinetic division. Another method, called director amitotic division, is where the nucleus simply constricts itself into two (Fig. 7). Thisis of rare occurrence,being found chiefly inold cells that have aboutrun their new cells formedby the dividing cells ofthe growing ap
. Plant anatomy from the standpoint of the development and functions of the tissues, and handbook of micro-technic. FIG. 6.—Various stages of cell multiplicationby budding of Saccharomyces cerevisias. (AfterReess.) The kind of nuclear division above described is called indirect,mitotic, or karyokinetic division. Another method, called director amitotic division, is where the nucleus simply constricts itself into two (Fig. 7). Thisis of rare occurrence,being found chiefly inold cells that have aboutrun their new cells formedby the dividing cells ofthe growing apices andcambium do not long remain in size, form, and other character-istics just as they are when first produced. In cross sections ofthe growing point of Aristolochia, for example (Fig. 8), the cellsare essentially all alike; but a little farther down the stem wefind zones and groups of tissues which arereadily distinguished from each other becausethe cells composing them differ in size, form,thickness of walls, etc. These cells and tissueshave all arisen by changes in cells that wereproduced by cell divis
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