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NdP Sargassum natans. Sargassum natans Illustration from Naturgeschichte des Pflanzenreichs table LII NaturgeschichtedesPflanzenreichsTafelLII NaturgeschichtedesPflanzenreichsTafelLII Jacob Sturm derivative work Thiotrix cut out for Sargassum natans Thiotrix NaturgeschichtedesPflanzenreichsTafelLII PDold Original upload log