. Plant physiology. Plant physiology. Pig. 16,—Schistostega osmundacea, A, protonema; B, diagram representing the path taken by rays of light as they enter and leave the cells of the protonema. dioxide decomposition by the chloroplasts. A part of the light is reflected, thus rendering the protonema luminous. In general, plants are adapted to the minimum of available light (Wiesner, Liubimenko). In heliophilous plants (which thrive best in bright sunshine) the rate of carbon dioxide decomposition increases continuously with increase in light intensity;'' on the other hand, for heliophobous plan
. Plant physiology. Plant physiology. Pig. 16,—Schistostega osmundacea, A, protonema; B, diagram representing the path taken by rays of light as they enter and leave the cells of the protonema. dioxide decomposition by the chloroplasts. A part of the light is reflected, thus rendering the protonema luminous. In general, plants are adapted to the minimum of available light (Wiesner, Liubimenko). In heliophilous plants (which thrive best in bright sunshine) the rate of carbon dioxide decomposition increases continuously with increase in light intensity;'' on the other hand, for heliophobous plants (which thrive in shade or in regions of low light intensity) there exists an optimum light intensity, and any increase beyond this optimum results in a decrease in the amount of carbon dioxide decomposed. This difference is related to the different amounts of chlorophyll contained in the two kinds of plants. Liubi- menko was able to show that heliophobous plants are richer in chlorophyll than are heliophilous ones. Within limits, the greater the amount of light '' It is not to be understood that there are no optimum light intensities for decomposition in plants that grow best in bright sunshine, only that such optima are markedly ;higher than those for plants that grow best in shade.— 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 Palladin, Vladimir Ivanovich, 1859-1922; Livingston, Burton Edward, 1875-; Hopping, Aleita, 1890-. Philadelphia, P. Blakiston's Son & Co
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