. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. OROWIXG POINTS 17 respective branches. A similar apical position of the growing point usually obtains amongst the lower plants. A good example is afforded by the little Seaweed Sphacdaria, which is not uncommon in rock-pools along the sea-shore. Here each branch ends in a single large cell (Fig. 5, a), which consti- tutes the growing point. During the active season of the year this cell is constantly increasing in size, and, when it has attained a certain length, it becomes halved by the formation of a cross-
. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. OROWIXG POINTS 17 respective branches. A similar apical position of the growing point usually obtains amongst the lower plants. A good example is afforded by the little Seaweed Sphacdaria, which is not uncommon in rock-pools along the sea-shore. Here each branch ends in a single large cell (Fig. 5, a), which consti- tutes the growing point. During the active season of the year this cell is constantly increasing in size, and, when it has attained a certain length, it becomes halved by the formation of a cross-. FiG. 6.—Growing point (a) and adjacent part of the thallus of Dictyota. Lettering as in Fig. 5. wall (Fig. 5, &). The upper portion again enlarges until a new septum arises, whilst the lower half (termed a segment) under- goes further division (Fig. 5, c-e) to form the cells of the mature plant. The Seaweed Dictyota furnishes another good instance of a unicellular growing point, whose mode of division will be understood by reference to Fig. 6. The daughter-cells or seg- ments in these two cases are cut off in a single series parallel to one face of the cell. In most plants having a unicellular growing point the apical. 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 Fritsch, Felix Eugene, 1879-; Salisbury, E. J. (Edward James), Sir, b. 1886. London, G. Bell and sons ltd.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpl, booksubjectplants
