Frailea castanea var. perumbilicata (F.Ritter) Prestlé, Gattung Frailea: 213. 1997 Frailea castanea var. perumbilicata (F.Ritter) Prestlé, Gattung Frailea: 213. 1997is new combination for Frailea perumbilicata F.Ritter in Succulenta (Netherlands) 49: 125. 1970Taxon for this nameFrailea castanea var. perumbilicata (F.Ritter) Prestlé