Effects of Airspeed and Humidity Changes on Spore Discharge in Sordaria fimicola

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Abstract
An improved experimental system is described for studying the rate of spore discharge in Sordaria fimicola subjected to an air-stream of controlled rate and relative humidity. Under nearly saturated conditions the rate of air-flow does not seem to affect the rate of discharge. Reduction of the R.H. from 95 per cent to 70 per cent or 35 per cent leads to an immediate but temporary increase in discharge rate. 70 per cent R.H. seems only to affect actual discharge, but prolonged exposure to 35 per cent R.H. interferes as well with earlier stages in spore development. It is suggested that the immediate effect on discharge is physical rather than biochemical. There is evidence that the perithecial wall plays some part in the control of spore discharge.

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