Butyriboletus appendiculatus is an edible pored mushroom that grows under oaks and other broad leaved trees such as beech. It is commonly known as the butter bolete. It often grows in large colonies beneath the oak trees, and is frequently found cohabiting with old oaks in ancient woodland. It is relatively rare in Britain. Its stipe and pores are often bright yellow and its flesh stains bright blue when cut or bruised.
Exsudoporus permagnificus is a species of bolete fungus in the family Boletaceae, native to Europe. Described as new to science in 1981, the fungus was originally placed in genus Boletus. Following molecular studies outlining a new phylogenetic framework for Boletaceae, the fungus was transferred to the newly erected genus Exsudoporus in 2014, to which it is the type species. Nevertheless, Wu and colleagues (2016) were reluctant to accept the newly proposed genus due to a lack of sufficient sequences and regarded it a synonym of Butyriboletus. A 2019 study by Loizides and colleagues reinstated the status of Exsudoporus as a monophyletic genus sister to Butyriboletus, following additional collections and extended phylogenetic and morphological analyses.
Butyriboletus floridanus is a species of bolete mushroom in the family Boletaceae. In 1945, American mycologist Rolf Singer described a species he found in Florida during his 1942–3 tenure of a Guggenheim Memorial Fellowship. He originally described it as a subspecies of the eastern North American species Boletus frostii, but later considered it worthy of distinct species status in a 1947 publication. Although known as a species of Boletus for over 50 years, the current interpretation, based on molecular phylogenetic analysis, is that the taxon belongs in the genus Butyriboletus.
Butyriboletus roseopurpureus is a species of fungus in the family Boletaceae. Found in eastern North America, it was officially described in 2000 as a species of Boletus, and transferred to the genus Butyriboletus in 2015.
Butyriboletus peckii is a fungus of the genus Butyriboletus native to eastern North America. It was first described by Charles Christopher Frost in 1878. Until 2014, it was known as Boletus peckii. Recent changes in the phylogenetic framework of the Boletaceae prompted the transfer of this species, along with several other related boletes, including Caloboletus calopus, to the genus Caloboletus. In 2015, Kuan Zhao and colleagues published analysis that demonstrated that the bolete belongs to Butyriboletus, closely related to Butyriboletus pulchriceps.
Butyriboletus querciregius is a pored mushroom in the genus Butyriboletus. Found in California, where it grows in a mycorrhizal association with coast live oak, it was described as new to science in 2014.
Butyriboletus roseoflavus is a pored mushroom in the genus Butyriboletus found in Asia. It was originally described in 2013 as a species of Boletus, but was transferred the following year to the newly created genus Butyriboletus.
Butyriboletus roseogriseus is a pored mushroom in the family Boletaceae found in Europe. It was originally described as a species of Boletus in 2014, but transferred later that year to the newly created genus Butyriboletus.
Butyriboletus sanicibus is a pored mushroom in the genus Butyriboletus. Found in China where it grows in association with Yunnan pine, it was described as a new species in 2014.
Butyriboletus subappendiculatus is a pored mushroom in the family Boletaceae. This European species was originally described as a species of Boletus in 1979, but later transferred to Butyriboletus in 2014. It is considered endangered in the Czech Republic.
Butyriboletus yicibus is a pored mushroom in the genus Butyriboletus. Found Yunnan, China, where it grows in association with Yunnan pine, it was described as a new species in 2014.
Butyriboletus abieticola is a pored mushroom in the family Boletaceae. It was originally described in 1975 by mycologist Harry Delbert Thiers as a species of Boletus, but transferred in 2014 to the newly created genus Butyriboletus.
Butyriboletus autumniregius is a pored mushroom in the family Boletaceae. It is found in California, where it fruits under Douglas fir and redwood.
Butyriboletus brunneus is a pored mushroom in the family Boletaceae. This North American species was originally described by Charles Horton Peck in 1890 as a variety of Boletus speciosus.
Butyriboletus ventricosus is a pored mushroom in the family Boletaceae. An Asian species, it was originally described in 2013 as a species of Boletus, but transferred to the newly created genus Butyriboletus the following year.
Butyriboletus fuscoroseus is a pored mushroom in the family Boletaceae. It was formerly considered a species of Boletus, but in 2014 was transferred to the newly created genus Butyriboletus. Boletus pseudoregius, a European taxon originally described as a subspecies of Boletus appendiculatus in 1927, is a synonym. B. fuscoroseus is considered critically endangered in the Czech Republic.
Butyriboletus fechtneri is a basidiomycete fungus in the family Boletaceae. It was formerly regarded as a species of Boletus, but in 2014 was transferred to the newly erected genus Butyriboletus, after molecular data revealed that it is a member of the "Regius" clade, quite distant from the core clade of B. edulis and closely allied species.
Butyriboletus primiregius is a pored mushroom in the family Boletaceae. Found in California, where it grows in a mycorrhizal association with fir, it was described as new to science in 2014.
Caloboletus is a fungal genus in the family Boletaceae. It was circumscribed by Italian mycologist Alfredo Vizzini with Caloboletus calopus as the type species. The erection of Caloboletus follows recent molecular studies that outlined a new phylogenetic framework for the Boletaceae. Boletus peckii was also transferred to this genus by Vizzini, but was subsequently moved to the genus Butyriboletus based on molecular evidence. The generic name Caloboletus, derived from the Greek calos "nice", refers to the attractive red coloring of the stipe.
Exsudoporus is a genus of fungi in the family Boletaceae. It was circumscribed in 2014 by Alfredo Vizzini and colleagues, following a number of molecular studies that outlined a new phylogenetic framework for Boletaceae and revealed the genus Boletus in its traditional circumscription to be polyphyletic. However, due to lack of sufficient sequences, Wu and colleagues (2016) were reluctant to accept the newly proposed genus and considered it a synonym of Butyriboletus. Following additional phylogenetic sequencing and morphological analyses, Loizides and colleagues confirmed the monophyly of Exsudoporus and reinstated the genus in 2019.
