In July 2009 Necydalis ulmi was found in Bukowa Forest near Szczecin (NW Poland). This species had not been recorded in Poland for the last 100 years. The habitat of this species is characterized. In the area where N. ulmi was found, numerous hollow trees infected with fungus Inonotus obliquus were recorded. It is known that N. ulmi is biologically dependent on this fungus species. Potential locations - in western and south-eastern Poland - where N. ulmi could eventually be found - are listed.