Close-up of warty lichen (Pertusaria) on a ...

The provided image shows an up-close view of a warty lichen growing on a fallen oak twig in Sam Houston National Forest in Texas.

The lichen is primarily light green with small, raised bumps that give it a "warty" appearance. It grows densely along the top surface and around the edges of the twig. At least two other types of lichens are present within the image, both on the same oak twig. A larger piece of lichen appears to be growing out of one of the smaller pieces. The lower right corner reveals a glimpse of another type of lichen with a mottled gray-green color and irregular shapes.

The background in this image is not visible due to the close-up nature of the photograph. – AI vision