Fistulinella cinereoalba sp. nov. and new distribution records for Austroboletus from Guyana.

Fistulinella cinereoalba sp. nov., Austroboletus rostrupii, previously known from southeastern Asia, and Austroboletus festivus from Brazilian Amazonia are described for the first time from the Guiana Shield.

New species of Boletellus from Guyana.

Boletellus exiguus sp. nov. and Boletellus dicymbophilus sp.

Tylopilus orsonianus sp. nov. and Tylopilus eximius from Guyana.

Tylopilus orsonianus sp. nov. and Tylopilus eximius (Boletaceae, Basidiomycota) are described for the first time from the Pakaraima Mountains of Guyana.