. Botany for secondary schools; a guide to the knowledge of the vegetation of the neighborhood. Plants. 457. Cross-section of fibro-vas- cular bundle of moonseed (see Fig. 455). /, /, crescent-shaped jheaths of bast fiber; p, phloem; cp, crushed phloem; c, cambium; d, xylem ducts; t, xylem tracheids; m, medullary rays of fundamental tissue; from c to / (at bottom), xylem; 1, end of first year's growth; 2, end of second year's growth of wood. mon arrangement of the bundles is in the form of a circle some distance from the center, with a few other bundles within the circle. Within the circle als
. Botany for secondary schools; a guide to the knowledge of the vegetation of the neighborhood. Plants. 457. Cross-section of fibro-vas- cular bundle of moonseed (see Fig. 455). /, /, crescent-shaped jheaths of bast fiber; p, phloem; cp, crushed phloem; c, cambium; d, xylem ducts; t, xylem tracheids; m, medullary rays of fundamental tissue; from c to / (at bottom), xylem; 1, end of first year's growth; 2, end of second year's growth of wood. mon arrangement of the bundles is in the form of a circle some distance from the center, with a few other bundles within the circle. Within the circle also are sometimes large areas of fibrous tissue. (Fig. 456.) There are, however, wide variations from this structure, but this mode of arrangement is often called the fern type of stem. 489. Three Types of Bundles- It has already been said (481) that every fibro-vascular bundle is made up of two parts: (1) phloem or soft bast; (2) xylem or wood. The relative position of these two strands of tissue is very important. There are three plans of arrange- ment, on which three types of These plans are collateral, bi-collateral ~*T5F3K bundles are based, and concentric. 490. In collateral bundles, the phloem and xylem are placed side by side, the xylem being nearer the center of the stem and the phloem outside or nearer the circumfer- ence of the stem. This plan occurs in the stems of phenogams. The col- lateral bundles may be either open or closed. Open bundles are those that continue to in- . ..„ 45S. Part of cross-section of root-stock of as Crease in Size during life agus, showing a few fibro-vascular bundle. 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 Bailey, L. H. (Liberty Hyde), 1858-1954. New York, Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectplants, bookyear1913
