. The Characeae of America. Berlin, 1862," we are greatly indebted. The apical cell (vegetative cell) of the new shoot throws off from its base a series of cells by repeated horizontal division. The api- cal cell itself remains plano- convex, and when its energy is exhausted, persists as a terminal cell of the same form. Each cell that is thrown off from the base of the apical cell divides immediately, by horizontal fissation, into two unequal cells, the lower shal- low and bi-convex, the upper deeper and bi-concave. The lower of this pair elongates without farther division and becomes a
. The Characeae of America. Berlin, 1862," we are greatly indebted. The apical cell (vegetative cell) of the new shoot throws off from its base a series of cells by repeated horizontal division. The api- cal cell itself remains plano- convex, and when its energy is exhausted, persists as a terminal cell of the same form. Each cell that is thrown off from the base of the apical cell divides immediately, by horizontal fissation, into two unequal cells, the lower shal- low and bi-convex, the upper deeper and bi-concave. The lower of this pair elongates without farther division and becomes a long internodal cell, often attaining a length of several inches (internodal cells six to eight inches long are not uncommon in lake forms of Nitella megacarpa, Allen). The upper bi-con- cave cell of the above pair forms a stem-node as follows : Soon after its appearance it divides, by vertical fissation. into two equal halving cells (see Fig. 13). In each of these half cells a series of pe- ripheral cells arise, by excen- tric division and in regular order, beginning first on one side of the septum, then on the other, and proceeding in alternation till the circle is closed. These peripheral cells are the starting points of an equal number of leaves. In Nitella the number of leaves. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Allen, Timothy Field, 1837-1902. New York : [s. n. ]
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