These shots are at the Blue Mountains, Sydney, Australia. I was looking at this tree because of its lovely white flowers. However, as i looked closer to get a close-up of the flowers, i saw the black lumps on the branches. I earlier thought they are plant characteristics, which might be common in these parts, anyway there are lots of biological materials that are unique to this country or this continent.
P.S. for those who will be interested to know about these insects, they are called plague soldier beetles. Stewart put the link at the comments below, here too: http://museumvictoria.com.au/about/mv-blog/jan-2012/plague-soldier-beetles/