The stress fields &sgr;ijand the dilatation field &Dgr; have been obtained in contour plots for a straight dislocation situated perpendicular to a reflection plane in an anisotropic crystal. A common characteristic feature of the results obtained for various metals at room temperature is that no twofold symmetry exists in any of &sgr;ijor in &Dgr; with respect to any axis normal to the dislocation line. For certain values of the modified elastic compliancesS16andS26, anomalous patterns have been found in the elastic fields that each of the &sgr;11, &sgr;33, and &Dgr; fields is divided into six sectors as compared to the usual cases of two sectors, and either of &sgr;12and &sgr;22fields is divided into two sectors in contrast to the normal pattern of six sectors. Some direct effects of the asymmetries and certain anomalies of these elastic fields on deformation processes are discussed.