Sporophore Production in Sphaerobolus with Special Reference to Periodicity

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Abstract
Further observations on temperature and fruiting are reported. The minimum and optimum values depend on the time when observations are made. The effect on discharge from sporulating cultures of illumination interrupted by dark periods (i-ii days) is considered. If the dark period does not exceed a day, harge recommences on the second and subsequent days of renewed illumina if it is 2–4 days, discharge occurs on the second day after return to light but not thereafter; if the period of darkness exceeds 5 days, discharge does not mmence on subsequent illumination until a completely new crop of sporophores is formed. Experiments are reported in which it is shown that at 20° C there is an interval of about I day between the onset of a dark period and the inhibition of discharge related to it. This period is increased to a day and a half at 10° C. At this temper an alternation of roughly equal light and dark periods each day leads to dis in the dark periods and not in the light periods as at 20° C. Experiments are reported which support the view that the long-term of discharge in cultures under constant conditions relates to inhibition of development of primordia by maturing sporophores.

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