 In 1931 , French mycologist Édouard @-@ Jean Gilbert transferred the species to the genus Ixocomus , a now @-@ defunct taxon that has since been subsumed into Suillus . In 1959 , Walter H. Snell , collaborating with Rolf Singer and Esther A. Dick , transferred the species to Suillus . In his 1986 version of the authoritative monograph The Agaricales in Modern Taxonomy , Singer included the species in the subsection Latiporini of genus Suillus , an infrageneric grouping ( below the taxonomic level of genus ) characterized by a cinnamon @-@ colored spore print without an olive tinge , and wide pores , typically greater than 1 mm when mature . 
