  In this work we prove an FBI characterization for Gevrey vectors on
hypo-analytic structures, and we analyze the main differences of Gevrey
regularity and hypo-analyticity concerning the FBI transform. We end with an
application of this characterization on a propagation of Gevrey singularities
result, for solutions of the non-homogeneous system associated with the
hypo-analytic structure, for analytic structures of tube type.
