The effect of temperature on the content of the medullary depsidone salazinic acid in Ramalina siliquosa (lichens)

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Abstract
The correlation between the content of the medullary depsidone salazinic acid in Ramalina siliquosa and some environmental factors (precipitation, sunshine, temperature) was examined. The salazinic acid content of the plants is higher where the annual mean temperature is higher, and the content of the plants growing on the dark-colored rock or on the southern face of the rock is higher than that of the plants growing on the light-colored rock or on the northern face of the rock, probably because the temperature on or near the surface of the former is higher than that of the latter. No significant correlation is observed between the salazinic acid content and the amount of precipitation or sunshine at the habitat. Temperature may be an important factor affecting the content of salazinic acid.

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