. Botany of the living plant. Botany. STRUCTURE OF THE ROOT 79 divisions of cells iust outside the tip of the cortex. The chief difference is tliat the piliferous layer is distinct in origin from the cortex, while in the Barley the)' were seen to have a common origin. A second t\'pe is illustrated by the Pea and other Leguminosae. {Fig. 6i, B.) Here the stele, cortex, piliferous layer, and root-cap all originate from a common mass of meristem, which occupies the apex, and segregates gradually into the several tissues as the cells mature. Such facts show that no theory of " germinal layers
. Botany of the living plant. Botany. STRUCTURE OF THE ROOT 79 divisions of cells iust outside the tip of the cortex. The chief difference is tliat the piliferous layer is distinct in origin from the cortex, while in the Barley the)' were seen to have a common origin. A second t\'pe is illustrated by the Pea and other Leguminosae. {Fig. 6i, B.) Here the stele, cortex, piliferous layer, and root-cap all originate from a common mass of meristem, which occupies the apex, and segregates gradually into the several tissues as the cells mature. Such facts show that no theory of " germinal layers " can have any general application in the development of the plant-body. The normal increase in number of roots is by the formation of lateral rootlets, which originate from deeply-seated tissues, and force their way. 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 Bower, F. O. (Frederick Orpen), 1855-1948. London, Macmillan and co. , limited
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1919
