. Elements of plant anatomy;. Botany -- Anatomy. loo ELEMENl'S Oh' l^LANT ANATOMY, the stem increases in diameter, the one-third leaf position changes to three-eighths, and the net-formed tube begins at the insertion of the hist leaf of the one-third arranofement. This may be illustrated by a diagrammatic sketch. In Fig. 43 let tlie shaded bands represent the vascular tissue, and the white or unshaded j^ortions the meshes ; the points of insertion of the leaves will then be at the places indicated by «, 5, c, etc. The leaf whose insertion occurs at a has a single bundle bending out at this 2:)
. Elements of plant anatomy;. Botany -- Anatomy. loo ELEMENl'S Oh' l^LANT ANATOMY, the stem increases in diameter, the one-third leaf position changes to three-eighths, and the net-formed tube begins at the insertion of the hist leaf of the one-third arranofement. This may be illustrated by a diagrammatic sketch. In Fig. 43 let tlie shaded bands represent the vascular tissue, and the white or unshaded j^ortions the meshes ; the points of insertion of the leaves will then be at the places indicated by «, 5, c, etc. The leaf whose insertion occurs at a has a single bundle bending out at this 2:)6int, which is formed by the union of two others originating at the points b and c, or the points where the bundles of the leaves b and c bend outward into them, their position in re- ference to point a being always that of the two next older leaves on either side. The repetition of this forms a net with rhomboid meshes. Each leaf receives also four to six bundles from along the sides of the network. In large and well developed plants, each leaf receives therefore as many as seven bundles, one at the lower angle of the mesh and six above, three on each side, as indicated at ?/. In the next year the stem becomes much thicker, the leaf position going over to five-thirteenths, Avhere it usually remains. The bundle system in the foregoing example is considered as made up of leaf-traces, and this is also true of that of many other ferns having this cylindrical network. In many kinds of fern-stems, however, it is impossible to ascertain the exact relation between leaf and stem bundles ; while in others it is decided that the network, otherwise similar to that described,. Fig. 43. Explained in 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 Gregory, Emily L. Boston, London, Ginn & Co.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbotanya, bookyear1895
