. Botany of the living plant. Botany. MECHANICAL CONSTRUCTION OF PLANT-BOnY 145 compared with that of the hohow steel columns used for supporting shop-fronts. A more frequent, and mechanically a more effective form of strengthening cell is seen in the elongated sclerenchyiiia-fibre. Such cells are commonly associated in masses, often forming strands which run continuously for long distances. These strands of the Flax supply the material for linen, of the Jute for sacking, of Hemp, New Zealand Flax, etc., materials for cordage, while similar strands of the Coco-. Flc. 104. Part of a transverse
. Botany of the living plant. Botany. MECHANICAL CONSTRUCTION OF PLANT-BOnY 145 compared with that of the hohow steel columns used for supporting shop-fronts. A more frequent, and mechanically a more effective form of strengthening cell is seen in the elongated sclerenchyiiia-fibre. Such cells are commonly associated in masses, often forming strands which run continuously for long distances. These strands of the Flax supply the material for linen, of the Jute for sacking, of Hemp, New Zealand Flax, etc., materials for cordage, while similar strands of the Coco-. Flc. 104. Part of a transverse section of the xerophiytic leaf of Haf:ea, showing a stoma greatly depressed below the weU-de\'eloped epidermis, which is propped out b>' thick-walled sclerotic cells. { x 150.) F. O. B. Nut, and other Palms are worked up into mats, brushes, etc. In the plant they frequently accompany the vascular strands, and are often associated with the phloem as bast-fibres, or with the xylem as Kvod- fibres (compare Fig. },}). But there is no necessary association with vascular tissues, and the sclerenchyma is often quite independent of them. The mechanical cells themselves arc elongated, with ends pointed and sides flattened, so that they fit closely together. (Fig. 105, A, B.) The cells of Hemp are about 100 times as long as broad, in linen the proportion is about 200 to I ; in the extreme case of the Rhea fibre {Boehmeria) the length has been estimated at 1500 times the breadth. The lignified walls may be so thickened that the cell-cavity is obliterated. Thev arc thus practically rods of resistant 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 Bower, F. O. (Frederick Orpen), 1855-1948. London, Macmillan and co. , limited
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1919
