SUMMARY: Treatment of male hyphae of the water mould with the female sex pheromone, antheridiol, caused them to stop extending. This response was accompanied by a marked decline in the characteristic inward current just behind the hyphal apex. After a hypha had stopped, a site of inward current developed some way behind the apex. Then an antheridial branch developed at this site. These responses only occurred in the absence of nutrients; in the presence of nutrients the hyphal extension rate and current pattern were unaffected by the addition of antheridiol.


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