Scientifically named Boletus luteocupreus (Boletales), it is an European bolete, so far known from Bulgaria, Corsica, France, Germany, Italy, Spain and Switzerland. Possibly seen in Greece.
The cap of this bolete reaches up to 12 cm, its coloration is variable, pastel yellow, pale yellow to pale orange, spoted light orange, dark orange or reddish orange. The flesh is lemon yellow, sometimes red in the stipe base, blueing instatly when exposed to the air then fading in half an hour and then changing to dingy orange red.
Boletus luteocupreus is a rare and inedible species that grows in warm deciduous forests, mycorrhizal with oaks (Quercus) and sweet chestnut (Castanea).
Photo credit: ©Marjan Kustera | Locality: Serbia