The image presents a close-up view of a small, flat, yellowish-green lichen covering the bark of what appears to be a hackberry tree. The lichen's circular spots are randomly distributed across the surface, with some areas appearing more densely populated than others.
**Key Features:**
* **Lichen:** Small, flat, yellowish-green
* **Distribution:** Randomly distributed across the surface
* **Density:** Varied across different areas of the bark
**Tree Identification:**
The tree is likely a hackberry (Celtis occidentalis) based on the description in the image caption. Hackberries are deciduous trees native to eastern North America and known for their distinctive, smooth grayish-brown bark.
**Location:**
Washington-on-the-Brazos State Historic Site, Washington, Texas
**Date:** November 24, 2020. – AI vision