pustulan
/ˈpʌstjʊlan/ /ˈpʌstʃʊlan/Biochemistry
noun
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.
Origin
1950s. Alteration of pustulin, after other names of polysaccharides ending in -an, e.g. glucosan, mannan.