Split Gill

Small tan mushroom about 25mm (1 in) across.
To view the 3D photo, get at least 50 cm (1 ft 8 in) from your monitor, (make sure to look directly at the monitor, not from the side) and cross your eyes just enough to bring the 2 photos together. You should see 3 photos and look at the "center" one. It may take a few seconds to become clear and 3D.