. Botany; principles and problems. Botany. THE PLANT AND ITS ENVIRONMENT 175 from the rain and dew. Structural features characteristic of these plants are a much thickened cuticle, protected stomata, and fleshy stems and leaves. Sijmhiosis.—In the relationships between the plant and other organisms in its environment which we have mentioned, the advantage has been one-sided. There are instances, however, of true symbiosis, an intimate relation between two plants, or. Fig. 94.—Epiphytes growing on a tree-tiiink. between a plant and an animal, where the advantage, to some extent at least, is mut
. Botany; principles and problems. Botany. THE PLANT AND ITS ENVIRONMENT 175 from the rain and dew. Structural features characteristic of these plants are a much thickened cuticle, protected stomata, and fleshy stems and leaves. Sijmhiosis.—In the relationships between the plant and other organisms in its environment which we have mentioned, the advantage has been one-sided. There are instances, however, of true symbiosis, an intimate relation between two plants, or. Fig. 94.—Epiphytes growing on a tree-tiiink. between a plant and an animal, where the advantage, to some extent at least, is mutual. A notable example of this is provideil by the whole group of Lichens, each member of which is a com- posite organism produced by the close association of a species of alga and a species of fungus (Fig. 182) and in which both seem to derive a certain amount of benefit from the union. The mycorrhiza, or association between a fungus and the root tip of a higher plant, which we have mentioned in a previous chapter, is evidently another example of the same state, as is probal)ly the connection, between the nitrogen-fixing root-tubercle bacteria and the leguminous plants in which they live. Passing higher in the vegetable kingdom, wc find many instan- ces of relationship between organisms which are also apparently. 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 Sinnott, Edmund Ware, 1888-. New York, McGraw-Hill
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbotany, bookyear1923
