Abstract
The mutual orientation of the germination of nearby pairs of Botrytis spores growing in a simple dilute medium was studied. When the medium was equilibrated with room air, they showed a very strong tendency to germinate both toward each other and in a cis arrangement, i.e. toward the same side of the line joining their centers. If the medium was equilibrated with air enriched with 0.3% or 3% CO2, (i.e. 10 or 100 times the normal CO2 concentration) then the cells showed an equally strong tendency to germinate away from each other. The interaction showed little dependence upon pH.

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