  We describe the presence of wavefront dislocations in magnetohydrodynamic
waves in stratified stellar atmospheres. Scalar dislocations such as edges and
vortices can appear in Alfv\'en waves, as well as in general magneto-acoustic
waves. We detect those dislocations in observations of magnetohydrodynamic
waves in sunspots in the solar chromosphere. Through the measured charge of all
the dislocations observed, we can give for the first time estimates of the
modal contribution in the waves propagating along magnetic fields in solar
sunspots.
