. The essentials of botany. Botany. Fio. 146.—Diagrammatic cross-sections of stems, showing the flbro-vas- cular bundles, /c, of which x is the woody side and p the softer or barlt side; b, b, b, bast-flbres; R, M, the fundamental tissues of the stem, of which R (the rind) is the cortical and M, the medullary portion, or pith ; ic, a belt of cambium which extends from bundle to bundle. arrangement they show great and important differences. The fibro- vascular bundles are of the col- lateral form, and are so placed in the stem that the harder and more woody side is nearer the centre of the stem
. The essentials of botany. Botany. Fio. 146.—Diagrammatic cross-sections of stems, showing the flbro-vas- cular bundles, /c, of which x is the woody side and p the softer or barlt side; b, b, b, bast-flbres; R, M, the fundamental tissues of the stem, of which R (the rind) is the cortical and M, the medullary portion, or pith ; ic, a belt of cambium which extends from bundle to bundle. arrangement they show great and important differences. The fibro- vascular bundles are of the col- lateral form, and are so placed in the stem that the harder and more woody side is nearer the centre of the stem, while the softer side is always nearer to the surface (Fig. 146, A). The inner part of the bundles is composed mostly of long, large cells, the tracheids, which have the well-known char- acteristic bordered pits (Fig. 147). The outer part contains, besides other tissues, a little fibrous tissue (bast-fibres). Between these two halves of the bundles there is a thin layer of growing cells (cam- bium) which is continuous with a layer between the bundles (Fig. 146, A and £). At this stage the stem is composed. Fig. lit. — Longitudinal section of wood of a Pine (Pinussylvestris). Bordered pits, t',t',t"; a-e, parts of six tracheids; st, large pits, where medullary rays touch tracheids. Magnified 335 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 Bessey, Charles E. (Charles Edwin), 1845-1915. New York : Holt
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbotany, bookyear1896
