This is an objective synonym of Jelskia Bourguignat, 1877, because he has the same type species, and is used today as Borysthenia.
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Suillus lacunosus was proposed by Otto Kuntze in 1898 as a new name for the species, and because of its earlier publication date, takes precedence over the superfluous name Boletus cookei proposed by Pier Andrea Saccardo and Hans Sydow in 1899.