One of the mysteries of the English language finally explained.
A polysaccharide consisting of glucose residues, originally isolated from the lichen Lasallia pustulata and also present in various other lichens (especially of the family Umbilicariaceae) and fungi.
1950s. Alteration of pustulin, after other names of polysaccharides ending in -an, e.g. glucosan, mannan.
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