Eucalyptus delegatensis, commonly known as alpine ash, gum-topped stringybark, white-top and in Victoria as woollybutt, is a species of tree that is endemic to southeastern Australia. It has a straight trunk with rough, fibrous to stringy bark on the lower half of the trunk, smooth white bark above, lance-shaped to curved adult leaves, flower buds in groups of between seven and fifteen, white flowers and barrel-shaped or hemispherical fruit.
Eucalyptus regnans, known variously as mountain ash (in Victoria), giant ash or swamp gum (in Tasmania), or stringy gum, is a species of very tall forest tree that is native to the Australian states of Tasmania and Victoria. It is a straight-trunked tree with smooth grey bark, but with a stocking of rough brown bark at the base, glossy green, lance-shaped to curved adult leaves, flower buds in groups of between nine and fifteen, white flowers, and cup-shaped or conical fruit. It is the tallest of all flowering plants; the tallest measured living specimen, named Centurion, stands 100 metres (328 feet) tall in Tasmania.
It often grows in pure stands in tall wet forest, sometimes with rainforest understorey, and in temperate, high rainfall areas with deep loam soils. A large number of the trees have been logged, including some of the tallest known. This species of eucalypt does not possess a lignotuber and is often killed by bushfire, regenerating from seed. Mature forests dominated by E. regnans have been found to store more carbon than any other forest known. The species is grown in plantations in Australia and in other countries. Along with E. obliqua and E. delegatensis it is known in the timber industry as Tasmanian oak.
Tasmanian oak is a native Australian hardwood produced by any of three trees, Eucalyptus regnans, Eucalyptus obliqua or Eucalyptus delegatensis, when it is sourced from the Australian state of Tasmania.Despite the common name "oak", none of the species are in the genus Quercus or the oak family Fagaceae.
The hardwood timber is light-coloured, ranging from straw to light reddish brown.It is used in construction, including panelling and flooring, for furniture, and also for reconstituted board and high quality paper.