The Suillaceae are a family

Family (biology)

In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...

 of fungi in the order Boletales

Boletales

The Boletales are an order of Agaricomycetes, containing over 1300 species with a diverse array of fruiting body types. The boletes are the best known members of this group, and until recently, the Boletales were thought to only contain boletes...

 (suborder Boletineae), containing the boletus-like Suillus

Suillus

Suillus is a genus of basidiomycete fungi in the family Suillaceae and order Boletales. Species in the genus are associated with coniferous trees, and are mostly distributed in northern temperate locations, although some species have been introduced to the Southern Hemisphere.-Taxonomy:The genus...

, the small truffle-like Truncocolumella

Truncocolumella

Truncocolumella is a genus of fungi in the Suillaceae family, of the Boletales order....

, as well as the monotypic

Monotypic

In biology, a monotypic taxon is a taxonomic group with only one biological type. The term's usage differs slightly between botany and zoology. The term monotypic has a separate use in conservation biology, monotypic habitat, regarding species habitat conversion eliminating biodiversity and...

 genus Psiloboletinus

Psiloboletinus

Psiloboletinus is a genus of fungi in the Suillaceae family. This is a monotypic genus, containing the single species Psiloboletinus lariceti, first described by mycologist Rolf Singer in 1945....

. As of 2008, there are 54 species in the family. Gastrosuillus, once considered a distinct genus, has been shown with molecular analysis

Molecular phylogeny

Molecular phylogenetics is the analysis of hereditary molecular differences, mainly in DNA sequences, to gain information on an organism's evolutionary relationships. The result of a molecular phylogenetic analysis is expressed in a phylogenetic tree...

 to be a recent evolutionary derivative of Suillus. Fuscoboletinus, described by Pomerleau and Smith

Alexander H. Smith

Alexander Hanchett Smith was an American mycologist known for his extensive contributions to the taxonomy and phylogeny of the higher fungi, especially the agarics.-Early life:...

in 1962, has also been subsumed into Suillus.