In this study abnormal structure of several wood specimens of Norway spruce, Picea abies (L) Karst., and Scots pine, Pinus sylvestris L., have been examined. These structures resemble to some extent the well-known mazur wood structure of Karelian birch (curly birch), Betula pendula Roth var. carelica (Mercklin) Hamet-Ahti. Both conifers with this kind of abnormal wood are very rare in Finland and their wood anatomy has never been studied in detail. The mazur wood of birch is characterized by a flower- or star-like figure which appears mainly as a vague and modified version on the cross planes of spruce and pine trunks. The xylem of conifers exhibits indentations in the growth ring boundaries in varying number and size. Similarly to Karelian birch, the darkest flecks in the conifers contain tissue of bark. Spruce has parenchyma flecks with dark deposits/content resembling that of the birch. The radial light bands of the spruce and pine seen on the cross plane are related to the abnormal grain structure. The tracheids change abruptly their orientation, and often they form different kinds of loops and swirls. Their size and shape also varies. In addition to the normal uniseriate rays there are two and three cells wide rays without resin ducts. These rays are lower than normal rays, and they vary in shape and orientation, too. Traumatic resin ducts are common. After removal of bark, depressions of various shapes and sizes become visible on the wood surface of both conifers the same way as in Karelian birch.