This is a photograph of Alexander Morrison (1849–1913), first Government Botanist of Western Australia.
Unknown author<span style="display: none;">Unknown author</span>
Unknown date<div style="display: none;">Unknown date</div>, but obviously in Morrison's lifetime.
It was taken from the Australian National Botanic Gardens website's biography of Morrison, located <a rel="nofollow" class="external text" href="http://www.anbg.gov.au/biography/morrison-alexander.html">here</a>.