Eucalyptus regnans , also called Mountain Ash , Victorian Ash , Swamp Gum , Tasmanian Oak or Stringy Gum , is a species of Eucalyptus from Victoria and Tasmania . Eucalyptus regnans , known variously by the common names Mountain Ash , Victorian Ash , Swamp Gum , Tasmanian Oak or Stringy Gum , is a species of Eucalyptus native to southeastern Australia , in Tasmania and Victoria .