Green Lichen

Scandinavian preserved natural lichen, commonly called polar moss or reindeer lichen.Lichens are composite organisms arising from symbiosis between a fungus and a species of algae.

Flavoparmelia caperata - Wikipedia

The Life of Lichen Midpeninsula Regional Open Space District

Greenshield Lichens – Hiker's Notebook

What is a lichen? Ausable River Association

Lichens

Thick green lichen growing on black tree branch Stock Photo - Alamy

Close up of green lichen growing on tree bark from tree trunk, UK

Common Greenshield Lichen

Lichens are harmless to trees

Green lichen hi-res stock photography and images - Alamy

Pale green lichen thallus on tree twigs. Apparently a sign of clean air Stock Photo - Alamy

Unusual lichen do not damage plant hosts

Moss or Lichen? - The Great Bay National Estuarine Research