. Principles of plant culture; an elementary treatise designed as a text-book for beginners in agriculture and horticulture. Horticulture; Botany. The Inner Structure of the Plantlet. 53 the roots of the turnip are "stringy" when the cells of their vascular bundles become thictened by the de- posit of woody ma- terial in them. 68. The Cam- bium (cam'-bi-um) Layer. In most plants having two or more cotyle- dons (45), a layer of cells in a state of division (15) • , -1 . ,1 Fig. 21. Showing cross-section of a vas- exiStS Detween tne cular bundle of the sunflower. (Helianthus 11 J ,1 -1
. Principles of plant culture; an elementary treatise designed as a text-book for beginners in agriculture and horticulture. Horticulture; Botany. The Inner Structure of the Plantlet. 53 the roots of the turnip are "stringy" when the cells of their vascular bundles become thictened by the de- posit of woody ma- terial in them. 68. The Cam- bium (cam'-bi-um) Layer. In most plants having two or more cotyle- dons (45), a layer of cells in a state of division (15) • , -1 . ,1 Fig. 21. Showing cross-section of a vas- exiStS Detween tne cular bundle of the sunflower. (Helianthus 11 J ,1 -1 annuus). Highly magnified. (After Prantl.) bark and the wood, see also Fig 22. called the cambium or cambium layer (Pig. 22). It is in this layer that growth in diameter of the stem oc- curs (70). The bark of plants having the cambium layer separates readily from the wood at times when growth is rapid, because the walls of the newly-formed cambium cells are extremely thin and tender. The slimy surface of growing wood, whence the bark has just been removed, is due to the protoplasm from the ruptured cambium cells. In plants having more than one cotyledon, the cambium line is usually readily dis- cerned in cross-sections of the stem—though it is rather more distinct and the bark is more readily separable in woody than in herbaceous* stems. In the latter, the part within the cambium line corresponds to the wood of woody stems, and that outside of it corresponds to the bark. * Herbaceous stems are those that do not have the hard, firm tex- ture of wood, as the potato, rhubarb, 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 Goff, E. S. (Emmett Stull), 1852-1902. Madison, Wis. University Co-operative Co.
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