Abstract
The fungus Pestalotiopsis palmarum , which needs light for sporulation, was found to sporulate in the dark on a medium containing 0.34–1.02 m -NaCl. An incubation for at least 8 h was required for induction of sporulation. Non-ionic osmotic compounds were ineffective. KC1 also induced dark-sporulation. The results suggested that the monovalent cation, Na + , in NaCl was responsible for sporulation. In the presence of KC1, MgCl 2 , CaCl 2 and BaCl 2 , the effect of NaCl was reduced or abolished.
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