. The essentials of botany. Botany. 38 BOTANT. 76. They occur on aerial leaves and stems most abun- dantly, being sometimes exceedingly numerous, and are exceptionally found elsewhere, as on the parts of the flow- ers. On submerged or underground stems and leaves they are found in less numbers, and from true roots they are always absent. The breathing-pores on leaves are gener- ally confined to the lower surface, and when present on the. Fig. 34.—A bit of the epideimis of Wild Cucumber (Echinocystis), showing breathing-pores at 8, s, s. At g^ p, the epidermal cells are irregular; at v, over a
. The essentials of botany. Botany. 38 BOTANT. 76. They occur on aerial leaves and stems most abun- dantly, being sometimes exceedingly numerous, and are exceptionally found elsewhere, as on the parts of the flow- ers. On submerged or underground stems and leaves they are found in less numbers, and from true roots they are always absent. The breathing-pores on leaves are gener- ally confined to the lower surface, and when present on the. Fig. 34.—A bit of the epideimis of Wild Cucumber (Echinocystis), showing breathing-pores at 8, s, s. At g^ p, the epidermal cells are irregular; at v, over a vein, they are more regular. Magnified SSO times. upper they are usually much fewer in number; there are, however, some exceptions to this. 77. In the light, under certain conditions of moisture and temperature, the guard-cells become curved away from each other in their central portions, thus opening the slit and allowing free communication between the external air and that in the intercellular spaces and passages of the 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 Bessey, Charles E. (Charles Edwin), 1845-1915. New York : H. Holt and company, ;
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