Elementary botany . two dif-ferent Ways. Those OII the Upper Slde communication between stomateanc J >? x the large intercellular spaces ot the of the leaf are usually long and pris- leaf stoma closed,matic in form and lie closely parallel to each other. Because ofthis arrangement of these cells they are termed the palisade cells,and form what is called the palisade layer. The other green cells, lying below,vary greatly in size indifferent plants and tosome extent also in thesame plant. Here wenotice that they arcelongated, or oval, orsomewhat irregular inform. The most striking peculiarity
Elementary botany . two dif-ferent Ways. Those OII the Upper Slde communication between stomateanc J >? x the large intercellular spaces ot the of the leaf are usually long and pris- leaf stoma closed,matic in form and lie closely parallel to each other. Because ofthis arrangement of these cells they are termed the palisade cells,and form what is called the palisade layer. The other green cells, lying below,vary greatly in size indifferent plants and tosome extent also in thesame plant. Here wenotice that they arcelongated, or oval, orsomewhat irregular inform. The most striking peculiarity, however, in their arrange-ment is that they are not usually packed closely together, but eachcell touches the other adjacent cells only at certain points. Thisarrangement of these cells forms quite large spaces between them,the intercellular spaces. If we should examine such a section ofa leaf before it is mounted in water we would see that the inter-* Demonstrations may be made with prepared sections of leaves,. Fig. 51. Stoma open. Figs. 34, 35.—Section through stomata of ivy leaf. 42 PHYSIOLOG Y. cellular spaces are not filled with water or cell-sap, but are filledwith air or some gas. Within the cells, on the other hand, wefind the cell-sap and the protoplasm. 82. Stomata.—If we examine carefully the row of epidermalcells on the under surface of the leaf, we find here and therea peculiar arrangement of cells shown at figs. 51, 52. This openingthrough theepi dermallayer is astoma. Thecells whichi m mediatelysurround the
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Keywords: ., bookauthoratk, bookcentury1900, bookdecade1900, booksubjectbotany
