This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 Excerpt: ...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 arrangement, on which three types of These plans are collateral, bi-collateral bundles are ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 Excerpt: ...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 arrangement, on which three types of These plans are collateral, bi-collateral 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 circumference of the stem. This plan occurs in the st ems of phenogams. The collateral bundles may be either open or closed. Open bundles are those that continue to in..., ._ 45S. Part ot cross-section of root-stock of Crease in Size UUrmg lite agus, showing a few fibro-vascular bundles. THE STUDY OF BUNDLES 289 by the presence of a growing layer at the line of union of the phloem and xylem. This layer of growing cells is called cambium. Dicotyledonous stems have open collateral bundles. (Fig. 455.) Closed bundles are those that cease growing very early and have no cambium or growing layer. They are called closed, perhaps from the fact that there is no means by which they may become larger. Stems of monocotyledons have bundles of the closed collateral type. Examine with high power cross-sections of menispermum stems and corn stems (see Figs. 454,455, 457), that have been stained with hematoxylin. Study the tissues found in a single bundle of each, with the aid of the illustrations. 491. In concentric bundles, the xylem is centrally placed in the 459. Enlargement of a single concentric bundle and the bundle from Fig. 458. phloem is all around it, as in club mosses and ferns (Fig. 456); or the phloem is in the center of the bundle and the xylem surrounds it, as in the ..
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Add this copy of Botany for Secondary Schools: a Guide to the Knowledge to cart. $74.74, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Santa Clarita, CA, UNITED STATES, published 2015 by Palala Press.
