Abstract
Thamnidium elegans produces either sporangia or sporangioles on discrete photo-tropic sporangiophores. The development of the sporangia resembles that of Phycomyces. The effects of light and temperature on the morphogenesis of the fungus have been studied by means of a specially built time-lapse camera. Illumination has been shown to favour the production of sporangia, to alter the duration of Stage I elongation, and to cause a transient growth rate decrease in both Stage I and Stage IV sporangiophores. The over-all rate of the reactions leading to the light-induced, growth-rate minimum shows a straight-line Arrhenius relationship with temperature, the growth rate minimum occurring earlier in Stage IV. The dark growth rates of Stage I and Stage IV are not affected by temperature in the same way. Experiments to show the relationship between the growth rate decrease and the positive phototropism are discussed, and it is suggested that the phototropic response falls into two well-defined stages.
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