Leaves whose blades are normally held in a vertical position possess palisade tissue and stomata on both sides (isobilateral leaves) (fig.
We do not, however, know its date, save that, if not Domitian's work, it was carried out soon after his death, and the whole frontier thus constituted was reorganized, probably by Hadrian, with a continuous wooden palisade reaching from Rhine to Danube.
In such leaves, there are a well-marked cuticle, a thick epidermis, a thick hypodermis at least on the upper side of the leaf, well-developed palisade tissue, and a poorly developed system of air-spaces.
The palisade layers of the mesophyll contain the larger number of chlorophyll grains (or corpuscles) while the absorption of carbon dioxide is carried on chiefly through the lower epidermis which is generally much richer in stomata.
These constitute a hypodermal layer, beneath which the chlorophyll cells of the parenchyma are densely packed together, and are elongated in a direction vertical to the surface of the leaf, forming the palisade tissue.
Border of the Lowland, one of these trap ridges lines the western bank of the Hudson river for about 25 m., and is known as the Palisade Ridge, or simply the Palisades, because of the scenic effect produced by the columnar jointing and steep eastern wall of the trap sheet.
The intercellular spaces are here very narrow channels between the palisade cells.
The leaves of shade plants have little or no differentiation of palisade tissue.
The ground about the hut was made solid and protected from corrosion by a palisade of wattled osiers, thus creating the earliest form of the fondamenta, or quay, which runs along the side of so many Venetian canals and is so prominent a feature in the construction of the city.
Is a belt of Triassic sandstone with intrusions of trap rock, which, on account of its peculiar columnar jointing, has developed a palisade structure - the famous Palisades of the lower Hudson.