Jonathan L. Frank

Butyriboletus regius (formerly Boletus regius), commonly known as the royal bolete or red-capped butter bolete, is a basidiomycete species of fungus in the genus Butyriboletus. It has a pink cap, yellow flesh, and a reticulate pattern on the stem. The mushroom is found in North America, Europe, and China. North America specimens stain blue when exposed to air, but European specimens do not, or only stain weakly. Both are edible and considered choice.

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 (hence its name of butter bolete) and its flesh stains bright blue when cut or bruised.

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 (named after B. regius), quite distant from the core clade of B. edulis and closely allied species. Butyriboletus fechtneri is native to Europe, where it forms ectomycorrhizal associations with various broad-leaved trees of the family Fagaceae, particularly oak (Quercus), beech (Fagus) and chestnut (Castanea). So far it has been

Butyriboletus is a genus of fungi in the family Boletaceae. The genus was circumscribed in 2014 by mycologists David Arora and Jonathan L. Frank to accommodate "butter bolete" species that were shown by molecular analysis to be phylogenetically distinct from Boletus. Butyriboletus contains 24 ectomycorrhizal species found in Asia, Europe, North America and north Africa. The group had earlier been classified as the section Appendiculati within the large genus Boletus. They were given the common name "butter boletes" as the color of their stalk, flesh and pores was similar to that of butter.

Psathyrella aquatica, commonly known as the aquatic gilled mushroom, is a species of fungus from Oregon, first described in the journal Mycologia in 2010. It represents the first ever report of a gilled basidiomycete fruiting underwater.

Butyriboletus subappendiculatus is a pored mushroom in the family Boletaceae. It was originally described as a species of Boletus in 1979 before being reclassified in the genus Butyriboletus in 2014. The fungus produces medium-sized fruiting bodies with brownish-orange to buff-coloured caps up to 8 cm across, lemon-yellow tubes and pores that do not bruise blue when damaged, and yellowish stipes covered with a fine network pattern. It fruits in upper-montane coniferous or mixed forests across Europe and into Turkey, primarily under Norway spruce or silver fir on neutral to calcareous soils at

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Rubroboletus pulcherrimus, known as Boletus pulcherrimus until 2015, and commonly known as the red-pored bolete, is a species of mushroom in the family Boletaceae. It is a large bolete from Western North America with distinguishing features that include a netted surface on the stem, a red to brown cap and stem color, and red pores that stain blue upon injury. The species is poisonous and potentially fatal, having been implicated in at least one death.

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.

Xerocomellus dryophilus, commonly known as the oak-loving bolete and formerly known as Boletus dryophilus or Xerocomus dryophilus, is a basidiomycete fungus in the family Boletaceae. It was transferred to the new genus Xerocomellus in 2014. Its epithet had been previously applied to a European species, now described as Xerocomellus redeuilhii. The reddish cap is up to 10 centimetres (4 in) wide and convex to plane. The pores are yellowish and often bruise blue, as does the flesh. The spore print is brown. The stem is up to 12 cm long, yellow at the top and reddish below. It is similar to X.

Caloboletus frustosus is a bolete fungus native to North America. Until 2014, it was known as Boletus frustosus. Recent changes in the phylogenetic framework of the family Boletaceae prompted the transfer of this species, along with several other related boletes, including Caloboletus calopus, to the genus Caloboletus. It was first described scientifically in 1941 by mycologists Wally Snell and Esther Dick.

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.

Xerocomellus diffractus, commonly known as the cracked-cap bolete, is a species of mushroom in the family Boletaceae. It is found in western North America.

Rubroboletus haematinus is a fungus of the genus Rubroboletus. First described scientifically in 1976 by Roy Halling as a species of Boletus, in 2015 it was transferred to Rubroboletus, a genus circumscribed the year previously to contain other allied reddish colored, blue-staining bolete species. It is found in the western United States.

Hortiboletus coccyginus, commonly known as the sumac-colored bolete, is a species of mushroom in the genus Hortiboletus. It is rare.

Craterellus calicornucopioides is an edible fungus in the family Cantharellaceae. Described by David Arora and Jonathan L. Frank in 2015, is the North American version of the similar European species Craterellus cornucopioides. Molecular phylogenetics has shown that they are, however, distinct species. C. calicornucopioides associates with and fruits in the vicinity of oaks, manzanita, madrone, and Vaccinium.

Craterellus atrocinereus, commonly known as the black chanterelle or California black chanterelle, is a species of edible fungus native to western North America. This uncommon species is a mycorrhizal associate of live oak, tanoak, and Oregon white oak in Oregon and northern California, where it is found most often in the vicinity of Monterey Bay. This species has a "fruity-cheesy" odor, and fruits in winter and spring. This bluish-gray to black chanterelle was previously considered to be Craterellus cinereus but was recognized as a distinct species in 2015. The specific name is a nod to C.

Caloboletus marshii, commonly known as Ben's bitter bolete, is a species of mushroom in the family Boletaceae. It is not poisonous, but it is too bitter to eat. It turns blue when cut or bruised, and it grows under live oak.

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. It is known as xiaomei niuganjun (Chinese: 小美牛肝菌; lit. 'little pretty bolete') or huamei niuganjun (Chinese: 华美牛肝菌; lit. 'fancy pretty bolete') in Yunnan and huandian niuganjun (Chinese: 黄靛牛肝菌; lit. 'yellow-cyan bolete') in Zhejiang. It was formerly misidentified as Boletus speciosus and Boletus appendiculatus. A mushroom identified as xiaomei niuganjun is implicated

Butyriboletus querciregius is a pored mushroom in the genus Butyriboletus. Found in California, where it grows in a mycorrhizal association with coast live oak (Quercus agrifolia), it was described as new to science in 2014.

Butyriboletus primiregius is a pored mushroom in the family Boletaceae. Found in California, where it grows in a mycorrhizal association with fir (genus Abies), it was described as new to science in 2014.

Butyriboletus persolidus is a pored mushroom in the family Boletaceae. It was described as new to science in 2014. The light brown cap is 6–14 centimetres (2+1⁄4–5+1⁄2 in) wide. The stipe is 5–9 cm (2–3+1⁄2 in) tall and 2.5–5 cm (1–2 in) thick. The flesh is yellow and can stain light blue; it has a mild taste. The spore print is brown. Outside of its genus, it can resemble Caloboletus species. From October to December, it can be found on the West Coast growing under hardwood trees, especially oak and tanoak.

Butyriboletus autumniregius, also known as the rosy autumn butter bolete, is a pored mushroom in the family Boletaceae. It is found in California and southern Oregon, where it fruits under Douglas fir and redwood.

Boletus rubriceps is a species of bolete fungus in the family Boletaceae. Although it was officially described as new to science in 2014, the bolete had previously been reported as either Boletus edulis or B. pinophilus. Molecular analysis showed that it was sufficiently different from other morphologically similar Boletus species to warrant designation as a distinct species. It is found in the southwestern United States and southern Rocky Mountains, where it associates with spruce, pine, and sometimes fir. The fruit bodies are edible and highly sought after; they are often sold in farmer's

Alessioporus rubriflavus is a species of fungus in the family Boletaceae. It was described in 2017 as the first North American member of the genus Alessioporus.

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Peziza oliviae is a species of fungus in the family Peziza. It is an olive-brown stalked cup fungus discovered growing underwater in streams in the U.S. State of Oregon.

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.