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The growth rhythm in several strains of "clock" mutants of Neuro spore crassu has been observed to have several unusual non-circadian characteristics. The period may range between 18 and 110 hours, depending upon strain and environmental condition. The phase of the rhythm, even when its period is 24 hours, is not related to a specific time of day, nor is it "set" or phased by light-dark cycles. Instead, the phase can be set by transfer to fresh medium; moreover, its specific chemical composition influences the length of the period. The period is significantly iiifluenced by temperature; the growth rate is a different function of temperature. All the strains show striking similarities in the functional deoendence of oeriod aiid ~ growth rate on temperature, even though

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