The image presents a close-up view of a medallion lichen (Dirinaria confusa) growing on the bark of a hackberry tree. The lichen's surface is densely covered with numerous small, circular depressions, known as apothecia.
**Key Features:**
* **Apothecia:** Small, circular depressions on the surface of the lichen.
* **Lichen Type:** Medallion lichen (Dirinaria confusa).
* **Substrate:** The bark of a hackberry tree.
* **Location:** Washington-on-the-Brazos State Historic Site, Texas.
**Overall Appearance:**
The image provides a detailed look at the unique appearance of medallion lichens and their growth habits on trees. – AI vision