Abstract: Pleurotus eryngii species-complex are known to be well distributed in Kurdistan region of Iran. During a survey in 2003-2005 fourteen wild populations of the Pleurotus eryngii species-complex were collected from Sanandaj, Hane Gelan and Saral areas. Echomorphological studies and pairing tests showed that all isolates were belong to P. eryngii and located into two groups associated with three Umbelliferous host plants including isolates associated with Prangos and Pimpinella with smaller spores and Ferula haussknechtii with larger spores. In this study we introduce Ferula haussknechtii as a new host species of P. eryngii in the world.