  We present a method to generate monstar singularities via Pancharatnam-Berry
phase by the coherent collinear superposition of two Free-Form Dark Hollow
beams, $FFDH^{m}_{q}$, of topological charge $q$, and order of symmetry $m$.
FFDH beams are generated with the geometrical parameters of a closed curve
exploited to obtain a nonuniform rotation rate of the local polarization
azimuth and generate monstar patterns. We report space-variant polarization
patterns: radial- and azimuthal-like, lemon- and star-like for symmetric
disclinations, and the asymmetric monstar disclination. We present theory and
measurements, and find excellent agreement between the two.
