. British plants; their biology and ecology. Botany; Botany; Plant ecology. INFLUENCE OF WATER ON LAND-PLANTS 41 4. The Leaf is thickened either by the increase of the palisade-tissue, or by the development of special water- storing cells. The former is strongly developed, in sun- leaves (Fig. 22), the latter tissue is found in succulents. The storage of water in fleshy or succulent organs is very common in desert and strand plants (see p. 277). All parts of the plant exposed to the air may become succulent —, the leaves in stonecrop (Fig. 7), the stems in glass- wort (Fig. 10). The water
. British plants; their biology and ecology. Botany; Botany; Plant ecology. INFLUENCE OF WATER ON LAND-PLANTS 41 4. The Leaf is thickened either by the increase of the palisade-tissue, or by the development of special water- storing cells. The former is strongly developed, in sun- leaves (Fig. 22), the latter tissue is found in succulents. The storage of water in fleshy or succulent organs is very common in desert and strand plants (see p. 277). All parts of the plant exposed to the air may become succulent —, the leaves in stonecrop (Fig. 7), the stems in glass- wort (Fig. 10). The water is stored in a special tissue, the cells of which are large and devoid of chlorophyll; the cell-sap is abundant, clear, but somewhat slimy through the presence of mucilage. The presence of mucilage in d. c~.. Fio. 9.—Tbansvbrsb Section of Rolled Leap of Erica cinerea. (Highly Magnefibd.) a, cuticle; 6, epidermis; c, mucilage in the cella ; d, chlorophyll-tissue; e, vascular bundle ; /, air-space ; g, stoma ; h, hair. water makes its evaporation difficult, and this difficulty is increased by the scarcity of air-spaces. Lignified tissue in succulents is also poorly developed, and there is little cork, the retention of water within the plant being secured by other means. 5. The Augmentation of Lignified and Corky Tissues. —This serves in leaves the same end as succulence— namely, the retention of water within the plant. No large reserves of water are here stored away for future use; in fact, the actual water-containing and water- conducting tissue is small; but what there is, is protected by masses of schrenchyma—elongated cells with thick,. 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 Bevis, James Frederick; Jeffery, Henry John. London, Methuen
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbotany, bookyear1920
