Some Observations on the Water-Relations of the Hyphae of Neurospora crassa

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Abstract
The morphology of the colony and of individual cells of the hyphae of Neurospora crassa are described. The behaviour of the hyphal apices in solutions of differing molarity is described and this behaviour is related to the behaviour of Fusarium oxysporum. Measurements of the water potential of the apical cells are made and it is shown that this corresponds to the balancing-point in this fungus and in F. oxysporum. Measurements are then made of the water potential of cells at various points along the length of the hyphae, and of the osmotic potential of these cells, and turgor pressure is calculated. The lowest turgor pressure of 12.4 atmospheres is shown by the apical cells and the highest of 17.5 atmospheres by the basal cells. The validity of the methods used is discussed.

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