. An introduction to vegetable physiology. Plant physiology. METABOLISM 279 matters are often deposited in the substance of cell-walls. The oxalate of calcium occurs frequently in this situation (fig. 127). In other cases it is deposited in special cells, where it forms clusters of crystals of characteristic shape (fig. 128, A, b). In these cases the cluster of crystals is usually invested by a delicate skin derived from the proto- plasm, thus shutting it off completely from any participa- tion in the metabolism of the cell in which it lies. Carbonate of calcium may also be deposited in the su
. An introduction to vegetable physiology. Plant physiology. METABOLISM 279 matters are often deposited in the substance of cell-walls. The oxalate of calcium occurs frequently in this situation (fig. 127). In other cases it is deposited in special cells, where it forms clusters of crystals of characteristic shape (fig. 128, A, b). In these cases the cluster of crystals is usually invested by a delicate skin derived from the proto- plasm, thus shutting it off completely from any participa- tion in the metabolism of the cell in which it lies. Carbonate of calcium may also be deposited in the sub- stance of the cell-wall, or of protrusions from it, as in the cystoliths of Ficus, Urtica, and other plants (fig. 129).. FiQ. 128.—Ceystals of Oxalate of Caloidm. a, fkom Beet (Sphcera- phidea); B, feom Arum (Raphidee). cyi—. 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 Green, J. Reynolds (Joseph Reynolds), 1848-1914. London, J. & A. Churchill
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