The First Identification of a Rare Fungus Calonarius fulvocitrinus (Cortinariaceae, Agaricales) from Quercus forests of the Black Sea Region of Türkiye

Calonarius fulvocitrinus is reported for the first time from Türkiye based on morphological description and molecular evidence. It is characterised by a yellow to greenish-yellow pileus with tiny scales in the center, yellowish lamellae, and is associated with Fagaceae. Based on phylogenetic analysis of the nuclear internal transcribed spacer (nrITS) sequences, the Turkish collection is placed in a well-supported clade along with its European representatives within the / Calochroi clade. Our results demonstrate the first distribution of this taxon outside the European continent and new to Türkiye.