Here is part of a dried eucalyptus (Eucalyptus globulus) leaf. Eucalyptus, or blue-gum, is a fast growing evergreen tree that can grow as tall as 100 m (330 ft) and get older than 250 years. The trees are native to Australia and Tasmania, and are a preferred food of koalas, much of whose habitat has been destroyed in recent fires. On the bottom left is a 0.5 mm diameter pencil lead for scale.
Equipment used: Canon EOS Rebel T5i with 49 mm long extension tube.