During a survey of fungi associated with Russian olive fruit rot in Northern Iran. a coelomycete fungus with setose pycnidia was isolated from symptomatic fruits. The fungus was identified as Chaetopyrena penicillata based on morphological characteristics and sequence data of ITS and LSU rDNA. A hyphomycete synanamorph. https://www.herbsdailyes.shop/product-category/laboratory-glassware-and-plasticware-microscope-slides/