Abstract
Marasmiellus istanbulensis from the Belgrade Forest of İstanbul in Marmara Region of Turkey is described and illustrated as a new species based on both morphological and molecular data. A description with field and micromorphological illustrations and comparisons with morphologically close and phylogenetically-related species are provided.
Acknowledgement
We are grateful to Pablo Alvarado (Alvalab, Oviedo, Spain) for assistance with the molecular analysis and phylogenetic tree.