Chaenotheca ferruginea

About

Chaenotheca ferruginea commonly known as the rusty stubble lichen, is a species of lichenized fungus that grows on willow tree bark as well as other sources of wood. This lichen species was originally discovered in the United Kingdom. However, there have since been many observations across the world, including in the United States, Europe, and in Australia. This species was originally described within the genus Calicium but has since been placed into the genus Chaenotheca.

Summary from Wikipedia