Ophiostoma piceaperdum and O. europhioides are well-known, first described from conifers in Canada. They have been considered to be synonymous. After studying the type material, as well as a collection of isolates of O. piceaperdum and O. europhioides, we have concluded that they cannot be distinguished from each other, so we support the synonymy of O. europhioides and O. piceaperdum and provide a description for the Leptographium anamorph of O. piceaperdum. Ceratocystis pseudoeurophioides has previously been distinguished from O. europhioides based on differences in anamorph morphology. This species has also been reduced to synonymy with O. penicillatum, which was reported to have cucullate ascospores. Later descriptions of O. penicillatum reported it to have allantoid ascospores. We conclude that C. pseudoeurophioides cannot be distinguished from O. piceaperdum and is, therefore, reduced to synonymy with that species.