lAli Kemal Ayan and 2Cüneyt Guam 1University of Ondokuz Mayıs, Junior College of Bafra, Samsun/1" urkey 2University of Ondokuz Mayis, Faculty of Agriculture, Department of Agronomy, Samsun/Turkey

Callus Induction in Some Hypericum Species Growing in Turkey

Ali Kemal Ayan,Cüneyt Çırak