Synonymy:
Boletus americanus Peck, Bull. N.Y. St. Mus. nat. Hist. 1(no. 2): 62 (1887)
Ixocomus americanus (Peck) E.-J. Gilbert, Les Livres du Mycologue Tome I-IV, Tom. III: Les Bolets: 93 (1931)

Ixocomus sibiricus Singer, Revue Mycol., Paris 3(2): 46 (1938)
Suillus sibiricus (Singer) Singer, Farlowia 2(2): 260 (1945)
Boletus sibiricus (Singer) A.H. Sm., Mushrooms in their natural habitats: 220 (1949)
Suillus americanus f. sibiricus (Singer) Klofac [as 'sibericus'], Österr. Z. Pilzk. 22: 216 (2013)

Suillus sibiricus subsp. helveticus Singer, Lilloa 22: 657 (1951) [1949]
Suillus americanus f. helveticus (Singer) Klofac, Österr. Z. Pilzk. 22: 216 (2013)

Suillus himalayensis B. Verma & M.S. Reddy, Nova Hedwigia 99(3-4): 543 (2014)
Suillus americanus f. himalayensis (B. Verma & M.S. Reddy) Klofac, in Klofac & Krisai-Greilhuber, Österr. Z. Pilzk. 28: 19 (2020)

Suillus americanus f. pseudosibiricus Klofac, in Klofac & Krisai-Greilhuber, Österr. Z. Pilzk. 28: 20 (2020)

Position in classification:
Suillus, Suillaceae, Boletales, Agaricomycetidae, Agaricomycetes, Basidiomycota, Fungi

Note:
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