. College botany; structure, physiology and economics of plants. Botany. STEMS, BULBS AND BUDS 45 In most cases it is not well defined, and its functio^n is not well understood, although, it is supposed to serve for ther conduction of carbohydrates. The fihro-vascular bundles each consist of two parts which are sep'arated by a layer of living cells known as the primary meri- siem or cambium. The outer part of the bundle is known as the phloem and is composed of bast fibers, sieve tubes and some other cells known as accompanying or companion cells. The inner. Fig. 24.—Diagrammatic drawing of se
. College botany; structure, physiology and economics of plants. Botany. STEMS, BULBS AND BUDS 45 In most cases it is not well defined, and its functio^n is not well understood, although, it is supposed to serve for ther conduction of carbohydrates. The fihro-vascular bundles each consist of two parts which are sep'arated by a layer of living cells known as the primary meri- siem or cambium. The outer part of the bundle is known as the phloem and is composed of bast fibers, sieve tubes and some other cells known as accompanying or companion cells. The inner. Fig. 24.—Diagrammatic drawing of section of dicotyledonous stem showing epidermis (a); cortex composed of collenchyma (6); parenchyma (c); medullary ray (d); fibro-vascular bundle composed of phloem (e); xylem (/); fibro-vascular cambium (p); interfibro-vas- cular cambium (/i); and central axis composed of parenchyma (i). part of the bundle is known as the xylem and is composed of wood fibers and tracheary tubes. The central axis or pith is made up of parenchyma tissue, which varies greatly in amount in the various plants. It is sometimes very large, constituting the greater part of fleshy stems and serving for the storage of water and reserve food. The Structure of the Monocotyledonous Stem.—^A cross- section of a solid monocotyledonous stem, such as the com, shows numerous fibro-vasctilar bundles scattered through a mass of parenchyma tissue, the entire structure surrounded by a hard,. 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 Cook, Melville Thurston, 1869-1952. Philadelphia and London, J. B. Lippincott Company
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbotany, bookyear1920
