The stipe surface of the boletes which have been placed usually in the genera Boletus and Xerocomus was studied. It was found that members of both these genera have the stipe surface fertile, composed of a caulohymenium with sporulating caulobasidia. An exception in this group is the species Boletus parasiticus whose stipe surface is sterile, covered with a trichodermium. This species is here separated into a new genus named Pseudoboletus. A new combination, Pseudoboletus parasiticus, is proposed. The species Pseudoboletus parasiticus is described in detail. Several notes on anatomy and taxonomy of this group of boletes are appended.
Šutara J. (1991): Pseudoboletus, a new genus of Boletales. – Česká Mykologie 45(1-2): 1–9.
