close-up of lichen on tree trunk

color common greenshield lichen flavoparmelia caperata flora nature plant rough wood algae autumn bark biodiversity biology botanical botany closeup dry environment fall food greenishgray growth leaf lichenology macro moss mycology outdoor parasitic pattern photobionts photosynthetic rotten season summer symbiosis symbiotic tree trunk vegetative wild wildlife covered showcasing textured layered close-up view greenish-gray appearance background blurred emphasizing lichen#39aph39#s intricate details