58In that context, a third party seeking a declaration of nullity of a plant variety right must adduce evidence and facts of sufficient substance to raise serious doubts as to the legality of the plant variety right following the examination provided for in Articles 54 and 55 of that regulation (see, to that effect, judgment of 21 May 2015, Schräder v CPVO (C‑546/12 P, EU:C:2015:332, paragraph 57).