A comparison was made of the morphology and growth kinetics of hyphae of differentiated and undifferentiated mycelia of Neurospora crassa. Undifferentiated mycelia were formed during exponential growth on solid media or submerged culture. Hyphae at the margin of differentiated mycelia (colonies) differed from undifferentiated mycelia in diameter, extension rate, extension zone length, and intercalary and apical compartment length. The mean hyphal extension rate (E) of an undifferentiated mycelium was a function of the length of the mycelium's hyphal growth unit (G) and the organism's specific growth rate (α). Thus, E=Gα.


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