In our paper on seaweeds of the Snellius-II expedition (Coppejans & Prud’homme van Reine, 1989) we suggested that the new species Rhipilia nigrescens had been described in Phycologia. Due to regulations of that journal and corroborated by the short spell between acceptance and publication in Blumea, the Latin description can no longer be expected to be published as suggested. To validate the name of the new species a Latin description and a designation of the holotype is published here.