Stem wood of Ostrya carpinifolia Scop. (European hophornbeam) grovvn in the Middle Black Sea Region ofThrkey vvas studied. O. carpinifolia is a species in the family Betulaceae. Sn general, the wood of O. carpinifolia can be characterized by diffuse-porous wood, vessels in radial multiplies of 4 or more, sinıple perforations, alternate intervessel pits, apotracheal parenchyma, rays homocellular to heterocellular. Helical thickenings and tyloses are present in the wood. The vvood is heavy (oven-dry density is 787 kgmr3) and hard.