''Rubroboletus lupinus'', commonly known as the wolf bolete, is a

bolete {{refimprove, date=July 2020 A bolete is a type of mushroom, or fungal fruiting body. It can be identified thanks to a unique mushroom cap. The cap is clearly different from the stem. On the underside of the cap there is usually a spongy su ...

fungus of the genus ''

Rubroboletus ''Rubroboletus'' is a genus of bolete fungi in the family Boletaceae. It was circumscribed by Chinese mycologists in 2014 with '' Rubroboletus sinicus'' as the type species. Species are characterized by having a reddish cap surface, yellow tub ...

''. Originally described by Elias Magnus Fries in 1838 as species of '' Boletus'', it was transferred to ''

'' in 2015, a genus

circumscribed In geometry, the circumscribed circle or circumcircle of a polygon is a circle that passes through all the vertices of the polygon. The center of this circle is called the circumcenter and its radius is called the circumradius. Not every po ...

to host other allied reddish-colored, blue-staining bolete species forming a distinct clade. The species epithet is derived from the

Latin Latin (, or , ) is a classical language belonging to the Italic branch of the Indo-European languages. Latin was originally a dialect spoken in the lower Tiber area (then known as Latium) around present-day Rome, but through the power ...

word ''lupus'', meaning "wolf". Molecular studies have revealed considerable genetic variation among European populations of ''R. lupinus'', placing it in a clade sister to ''

Rubroboletus dupainii ''Rubroboletus dupainii'', commonly known as Dupain's bolete, is a bolete fungus of the genus ''Rubroboletus''. It is native to Europe, where it is threatened, and red listed in six countries. It also occurs in North America, although it is ra ...

''. The species is found in warm broad-leaved forests, forming

ectomycorrhizal An ectomycorrhiza (from Greek ἐκτός ', "outside", μύκης ', "fungus", and ῥίζα ', "root"; pl. ectomycorrhizas or ectomycorrhizae, abbreviated EcM) is a form of symbiotic relationship that occurs between a fungal symbiont, or mycob ...

associations with various species of oak (''

Quercus An oak is a tree or shrub in the genus ''Quercus'' (; Latin "oak tree") of the beech family, Fagaceae. There are approximately 500 extant species of oaks. The common name "oak" also appears in the names of species in related genera, notably ' ...

'') and sweet chestnut ('' Castanea'').

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lupinus ''Lupinus'', commonly known as lupin, lupine, or regionally bluebonnet etc., is a genus of plants in the legume family Fabaceae. The genus includes over 199 species, with centers of diversity in North and South America. Smaller centers occur ...

Fungi described in 1838 Fungi of Europe Taxa named by Elias Magnus Fries {{Boletales-stub