Gametophyte morphogenesis of a fern Polystichum aculeatum L. Roth of Ukraine's flora in culture in vitro - L. M. Babenko; K. O. Romanenko; M. M. Shcherbatiuk; O. V. Vasheka; P. O. Romanenko; V. A. Nehretskyi; I. V. Kosakivska (Reports of the National Academy of Sciences of Ukraine, 2017)