Abstract
The hot water extract of conidiospores of Aspergillus niger was previously found to contain two types of sulfur compounds (1). Major one of these compounds (Substance A) was isolated from the extract and obtained in a crystalline form. This was identified as choline sulfate by chemical and physical methods. The amount of this sulfate ester in the spores was found to be exceedingly large, being as much as 1.5 per cent of the dry weight of the spores. It is suggested that this substance acts as a store of reserve sulfur in the spores of this fungus.
