
Eucalyptus haemastoma
This tree has a smooth grey bark that sheds itself in short ribbon like pieces. It reveals a light yellow trunk and branches with scribbles. Hence the term scribbly gum. These scribbles are tunnels that are made by the larvae of the Scribbly Gum Moth

"Eucalyptus haemastoma", commonly known as scribbly gum, is a species of tree that is endemic to the Sydney region. It has white or silvery grey bark, lance-shaped or curved adult leaves, flower buds in groups of between nine and fifteen, white flowers and conical or hemispherical fruit. It is one of three eucalypts with prominent insect scribbles in the bark.