. A manual of botany. Botany. 368 MANUAL OF BOTANY lie towards the centre of the cylinder, and later others appear nearer the periphery. Further development leads to increasing irregularity in the ring-like arrangement, so that in an older stem the bundles seem to be scattered irregularly in the cylinder (fig- 751). The bundles are of the collateral type, but as differentiation Fig. Fki 752. Collateral bundle from stem of a Monocotyledon, ph. Phloem. X Xylem vessels, Protophloijm. Protoxylem. The bundle is surrounded by a small-celled sheath of solerenehyma. After Kny. of the
. A manual of botany. Botany. 368 MANUAL OF BOTANY lie towards the centre of the cylinder, and later others appear nearer the periphery. Further development leads to increasing irregularity in the ring-like arrangement, so that in an older stem the bundles seem to be scattered irregularly in the cylinder (fig- 751). The bundles are of the collateral type, but as differentiation Fig. Fki 752. Collateral bundle from stem of a Monocotyledon, ph. Phloem. X Xylem vessels, Protophloijm. Protoxylem. The bundle is surrounded by a small-celled sheath of solerenehyma. After Kny. of the tissues proceeds, all the procambium is transformed into permanent tissue, so that the bundles are closed, containing no cambium. The protoxylem is at the apex of the bundle, and consists of one or two spiral or annular vessels {fig. 152, ). The large ducts or vessels on the wings of the bundle are next developed and then the remainder of the wood. The proto- phloem is at the back of the bast (fig. 15% ). The whole. 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 Green, J. Reynolds (Joseph Reynolds), 1848-1914. London, J. & A. Churchill
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