Boletus hiratsukae, sp. nov. is described and illustrated from Japan. It belongs to section Boletus and is characterized by the fuliginous to dark brown color of both the pileus and stipe, a dry, pruinose-subvelutinous pileus without any rugosity throughout its development, and by a palisade trichodermium structure of the pileipellis in which the element hyphae are often submoniliform with shortened, more or less inflated, terminal and subterminal cells. Data on the habitat suggest that it may form mycorrhizal associations with members of Pinaceae, especially Abies and Pinus.
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