Abstract
A study was made of growth, septation and branching in Geotrichum candidum, a mould which forms physiologically complete septa. A correlation was observed between septation and branch initiation; branches were almost invariably formed just behind septa. Primary branches and their parent intercalary compartments initially increased in length at an exponential rate before eventually attaining a constant rate of extension. The whole branching system (which eventually contained seven tips) produced by an intercalary compartment increased in length exponentially until it attained a total length of at least 1-5 mm. The total length and the number of nuclei of undifferentiated mycelia increased exponentially at the same specific growth rate. The results suggest that nuclei divide just before or just after arthrospore formation.
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