Caloboletus radicans (Pers.) Vizzini (Boletaceae) in the Republic of Mordovia

The article provides information about the first finding in the Republic of Mordovia of an infested or whitish (Caloboletus radicans (Pers.) Vizzini, 2014), more commonly referred to as Boletus radicans (Pers.) Fr. The history of the description of this species, the etymology of the name, the peculiarities of ecology, the general distribution on the globe and in Russia are outlined. It is shown that this species is located in Mordovia on the northern border of its range, forms mycorrhiza with oak (Quercus robur L.), belongs to typical thermophilic species, usually appears in years with a dry and hot summer or after such years it is drought resistant, since fruit bodies can appear even with a small amount of precipitation. A description of the macro- and microstructures of the species, made on the basis of the material of the author, is given. The article indicates the location of the macromycete, its coordinates and the dates of the finds. The sizes of the fruit bodies found were typical of the species. Due to the fact that C. radicans belongs to rare species, it is included in the second edition of the Red Book of the Republic of Mordovia with category 3 (rare species), it is recommended to search for its new locations, control (monitor) the state of the population, educational work for his protection.