 The species was first described scientifically by French botanist Jean Baptiste François Pierre Bulliard in his 1788 Herbier de la France . Later synonyms include Boletus constrictus by Christian Hendrik Persoon in 1801 , Leccinum <unk> by Samuel Frederick Gray in 1821 , Suillus cyanescens by Petter Karsten in 1882 , and <unk> cyanescens by Günther Beck von <unk> und <unk> in 1923 . The variety violaceotinctus was described by Roy Watling in 1969 from collections made in Michigan , USA . 
