 According to Singer 's 1986 arrangement , S. sibiricus is classified in the subsection Latiporini of section Suillus in the genus Suillus . Section Suillus includes species with glandular dots on the stem , and a partial veil which becomes appendiculate on the cap edge . Characteristics of species in subsection Latiporini include cinnamon @-@ coloured spore prints without an olive tinge , and wide pores on the underside of the cap ( wider than 1 mm when mature ) . Other species in the subsection include S. flavidus , S. umbonatus , S. punctatipes , and S. americanus . 
