. An introduction to vegetable physiology. Plant physiology. 146 VEGETABLE PHYSIOLOGY are in the spongy tissue which occupies the lower half of the thickness of the leaf (fig. 86). The guard-cells of the stomata, however, always contain them. The green cortex of young stems and twigs also exhibits them. In such plants as the Casuarinas and the Equisetums (fig. 87), in — Fig. 86,-Teansvekse Section of portion of the Blade of the Leaf of Beta, cu, cuticle ; ep, epidermis; , palisade tissue ; , spongy tissue • , vascular bundle ; st, stoma; , intercellular space ' which the le
. An introduction to vegetable physiology. Plant physiology. 146 VEGETABLE PHYSIOLOGY are in the spongy tissue which occupies the lower half of the thickness of the leaf (fig. 86). The guard-cells of the stomata, however, always contain them. The green cortex of young stems and twigs also exhibits them. In such plants as the Casuarinas and the Equisetums (fig. 87), in — Fig. 86,-Teansvekse Section of portion of the Blade of the Leaf of Beta, cu, cuticle ; ep, epidermis; , palisade tissue ; , spongy tissue • , vascular bundle ; st, stoma; , intercellular space ' which the leaves are rudimentary, definite longitudinal bands of cells in the young stems contain them. The structure of such a chloroplast as is characteristic of one of the higher plants has not been very completely investigated. There is undoubtedly a protoplasmic basis with which the colouring matter is in some 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 Green, J. Reynolds (Joseph Reynolds), 1848-1914. Philadelphia, P. Blakiston
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