Abstract
Both light and low temperature induce the production of sporangia as opposed to sporangioles in Thamnidium elegans . Although continuous light favours the production of sporangia, there seems also to be a light-activated inhibitor which acts on the system responsible for the light induction of sporangia. The activity of this inhibitor is no longer evident when intermittent light of 30 sec. light and 30 sec. darkness is used. It is possible to predict, from the temperature at which each of the continuous-light experiments were carried out, at what time the light-induced slowing of growth rate would have occurred. It seems that the time taken for the growth-rate minimum to occur is directly proportional to the percentage of sporangia which will be produced by the colony. It is concluded that the light-induced slowing of the sporangiophore growth rate and the induction of sporangia by light are related processes.
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