The image is a close-up of a tree trunk with a rough, textured surface. The bark of the tree is rough and uneven, with deep grooves and cracks running through it. In the center of the image, there is a small, circular patch of green lichen growing on the bark. The lichen appears to be a type of lichen, with small, irregularly shaped patches of white and gray. The overall appearance of the bark is rough, with some areas appearing darker and others lighter.