Abstract
The effect of temperature on the content of the medullary depside divaricatic acid or the hymenial depsidone salazinic acid inRamalina subbrevisuscula was examined. The higher the contents of both lichen substances, the higher the annual mean temperature of the habitat. The plants growing on dark-colored rocks contained a larger amount of these lichen substances than those growing on the light-colored rocks in the same temperature zone. Thus, the temperature on or near the surface of the rock seems to control the contents of both medullary and hymenial compounds inR. subbreviuscula as well as the content of salazinic acid inR. siliquosa (Hamada, 1982b).
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