. A practical course in botany, with especial reference to its bearings on agriculture, economics, and sanitation. Botany. Fig. 122. — Internal structure of a pine stem, showing longitudinal section of a fibrovascular bundle through » medullary ray, sm, sm': s, tracheids; t, bordered pits, surface view; c, cambium; -a, sieve tubes; vt, sieve pits, analogous to the sieve plates in dicotyl stems. stem as it appears under the microscope, labeling correctly all the parts observed. Show the shape and relative size of the different cells. Com- pare your drawings with those made in your study of mono
. A practical course in botany, with especial reference to its bearings on agriculture, economics, and sanitation. Botany. Fig. 122. — Internal structure of a pine stem, showing longitudinal section of a fibrovascular bundle through » medullary ray, sm, sm': s, tracheids; t, bordered pits, surface view; c, cambium; -a, sieve tubes; vt, sieve pits, analogous to the sieve plates in dicotyl stems. stem as it appears under the microscope, labeling correctly all the parts observed. Show the shape and relative size of the different cells. Com- pare your drawings with those made in your study of monocotyl stems, and write in your notebook the essential points of difference between the two. 117. The stems of coni- fers, the group of Gymno- sperms to which the pine belongs, do not differ greatly from those of dicotyls, the chief difference being that the vascular bundles contain tracheids only, correspond- ing to the smaller vessels of. Fig. 123. — Internal structure of a pine stem, showing transverse section of a tra- cheid : i, cell walls; m, intermediate layer between walls of adjoining cells; m', inter- cellular space here occupied by substance of intermediate layer; b, bordered pit in section at right angles to the surface; t, membrane for closing the pit 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 Andrews, Eliza Frances, b. 1840; Lloyd, Francis Ernest, 1868-1947. ed. New York, Cincinnati [etc. ] American book company
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