  We present the results of numerical simulation of elastic properties of
phagraphene, a recently predicted but not synthesized yet quasi-two-dimensional
allotrope of graphene. We show that the Poisson'ss ratio is positive for the
planar configuration of phagraphene and negative for the nonplanar one. Both
the Poisson's ratio and the Young's modulus are isotropic for the planar
phagraphene and strongly anisotropic for the nonplanar phagraphene.
