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The tropic responses of Funaria hygrometrica spores to continuous illumination with red light (610 to 690 mμ) have been studied over the intensity range from 10 -5 through 10 +6 erg/cm 2 second, using both plane polarized light and partial illumination with unpolarized light. From the relative frequency of outgrowth origin in different directions, the following is inferred...