. Plant anatomy from the standpoint of the development and functions of the tissues, and handbook of micro-technic. Plant anatomy. THE PRIMARY PERMANENT TISSUES 29 â J . I Mm proof. This occurs in its greatest purity as a thin film at the outer surface known as the cuticle. In some instances scales and rods of wax are deposited at the surface and cause the so- called bloom, as on the plum, grape, stems of some grasses, etc., where they are easily rubbed off on account of their deli- cacy. In sections under the microscope the wax, cuticle, and cutinized parts of the wall are readily distinguish
. Plant anatomy from the standpoint of the development and functions of the tissues, and handbook of micro-technic. Plant anatomy. THE PRIMARY PERMANENT TISSUES 29 â J . I Mm proof. This occurs in its greatest purity as a thin film at the outer surface known as the cuticle. In some instances scales and rods of wax are deposited at the surface and cause the so- called bloom, as on the plum, grape, stems of some grasses, etc., where they are easily rubbed off on account of their deli- cacy. In sections under the microscope the wax, cuticle, and cutinized parts of the wall are readily distinguish- able by their yellow color when treated with chloro- iodide of zinc, while the cellulose portions of the wall assume at the same time a purplish color. The thickening and cutini- zation of the outer wall makes of the epidermis an excellent protective tissue against loss of water, parasitic fungi, and, to a certain extent, mechan- ical injury. How quickly, for example, an apple will begin to dry up and decay when its epidermis is pared away. The cells of the epidermis remain living so long as they are not cut off from the water supply by the formation of cork tissue. Their protoplasts exist as a very thin and hardly dis- tinguishable film lining the walls. In rare instances, particularly in the Monocotyledons, the epidermal cells contain chloroplasts; and sometimes, as in fruits and foliage plants, a colored cell- sap; but in most cases they are colorless and permit the unim- peded entrance of light. While they live the epidermal cells. 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 Stevens, William Chase, 1861-. Philadelphia, P. Blakiston's Son
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectplantanatomy, bookyea
