Public domain images of trees: Mossy tree bark (Unsplash)

Yosemite National Park, United States

Picryl description: Public domain photograph of Yosemite National Park, nature, free to use, no copyright restrictions image.

A close up of a tree trunk covered in green moss.

This image is from Unsplash and was published prior to 5 June 2017 under the Creative Commons CC0 1.0 Universal Public Domain Dedication. Media published on Unsplash from 5 June 2017 onwards is not considered to be freely licensed.