Cortinarius gueneri: A new species from the Euro-Siberian Floristic Region of Turkey

<em>Cortinarius gueneri</em> (subgen. <em>Telamonia</em> sect. <em>Laeti</em>) is described as a new species from Turkey based on morphological and molecular data. It can be recognized by the somewhat irregular conical to campanulate, translucent-striate, rusty brown pileus; pale yellowish cinnamon broadly attached lamellae; salmon pinkish stipe; narrowly amygdaloid ellipsoid basidiospores; its putative association with <em>Carpinus orientalis</em>. Full description of given field photos, microscopic illustrations, short discussion. Phylogenetic analysis internal transcribed spacer (ITS) region also provided.