SUMMARY: Early growth of the filamentous actinomycete A3(2) on solid medium was investigated. Growth kinetics were similar to those of filamentous fungi in that total mycelial length and the number of branches increased exponentially at the same specific rate, with attainment of a constant hyphal growth unit. However, both germ tube and branch hyphae showed initial linear, rather than exponential extension. Logarithmic relationships were found between branch order and both branch length and branch number, although the constancy of these relationships varied during growth. Length ratio, obtained from branch pattern analysis, reached a constant value as did the hyphal growth unit, but branch ratio did not become constant during the period of study. There was some evidence of mycelial development analogous to that found in filamentous fungi.


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