The natural history of plants, their forms, growth, reproduction, and distribution; . beams, strengtheningprops, and the like, are placed at definite points. TRANSPIRATION. 279 In most thin membraneous leaves the upper and under sides are differentlyconstructed, and the difference is not confined only to the cuticle, but is also plainlyrecognizable in the green tissue. The green cells below the epidermis on the upperside of the leaf have the form of prisms, cylinders, or short tubes, and are arrangedvery regularly in ranks and files. In the leaves of plants belonging to the lilytribe, they lie
The natural history of plants, their forms, growth, reproduction, and distribution; . beams, strengtheningprops, and the like, are placed at definite points. TRANSPIRATION. 279 In most thin membraneous leaves the upper and under sides are differentlyconstructed, and the difference is not confined only to the cuticle, but is also plainlyrecognizable in the green tissue. The green cells below the epidermis on the upperside of the leaf have the form of prisms, cylinders, or short tubes, and are arrangedvery regularly in ranks and files. In the leaves of plants belonging to the lilytribe, they lie with their long axes parallel to the surface; but in most other plantsthese cylindrical cells have their smaller side directed to the surface, and stand sideby side like palisades, with only very narrow air-passages between them. Belowthese palisade-cells, and bordering on the epidermis of the under side of the leaf, isanother stratum of cells of a much looser texture (see fig. 62^). The cells of thisunder layer are not so crammed with chlorophyll, and therefore appear a lighter.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1902
