Since then, other genera have been defined gradually, such as Tylopilus by Petter Adolf Karsten in 1881, and old names such as Leccinum have been resurrected or redefined.
European beech forms ectomycorrhizas with a range of fungi including members of the genera Amanita, Boletus, Cantharellus, Hebeloma and Lactarius; these fungi are important in enhancing uptake of water and nutrients from the soil.
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.
The species was first named by Moses Ashley Curtis as Boletus ananas in 1848, based on specimens he found near the Santee River, in South Carolina.
Boletus luteocupreus is a species of bolete fungus in the family Boletaceae native to southern Europe, where it is found under chestnut (Castanea).
Although the first specimen was originally collected in New England in 1856 by Charles James Sprague, a formal scientific description was not published until 1872 when Miles Joseph Berkeley and Moses Ashley Curtis called it Boletus spraguei.
In 1875, Charles Horton Peck described Boletus nigrellus from specimens he collected in Sand Lake, New York.
The species was first named 1936 as Boletus felleus forma plumbeoviolaceus by American mycologist Walter H. Snell and one of his graduate students, Esther A. Dick, based on specimens found in the Black Rock Forest near Cornwall, New York.