Hyphal population dynamics. For six distinct time points, probability density curves of hyphal diameters are shown. 2 hours prior to carbon depletion, a single population of hyphae with a mean diameter of approximately 3 μ m was detected. After carbon depletion, a second population with a significantly reduced mean diameter of approximately 1 μ m started to emerge. Throughout the course of starvation, the ratio of thin/thick hyphae gradually increased, indicating secondary growth on the expense of dying compartments.