The image shows a close-up of a tree trunk covered in a thick layer of yellow lichen. The lichen is spread across the bark of the tree, covering the entire surface of the trunk. The bark appears to be rough and textured, with deep grooves and cracks visible. The yellow color of the lichen stands out against the dark brown of the bark, creating a striking contrast. There are also a few small white lichen scattered throughout the image, adding a pop of color to the otherwise monochromatic scene.