Smooth bristle bracket mushroom (Phellinus ...

The image showcases a close-up view of what appears to be a mushroom growing on the side of a fallen tree trunk. The top portion of the image features a dark brown or black section with rough texture and small green patches visible at the top left corner.

Moving down from this initial segment, a lighter-colored area dominates the center-left part of the image. This section exhibits a smooth surface with a tan to brown hue, featuring some darker brown splotches that are more prominent on the right side of the image. The lower half of the image consists of an even darker brown or black region characterized by coarse texture and numerous cracks.

The overall appearance suggests that the mushroom has grown on top of a fallen tree trunk, which was likely once part of a larger oak tree, as indicated in the caption. – AI vision