Melbourne is well known for the number of parks and open spaces that it has - and while these are far from being "wild" they are much wilder than my backyard, and as a result I rather like them.
Australian trees are a bit different to most other tree - many of them are eucalyptus - gum - trees, and these do not really occur elsewhere in the world. This species has a smooth bark that flakes off in irregular sections every year. This may explain why many never gain the forest of lichens that cloak many other trees.
These shots are close ups of the bark of a species of gum.