Lichen growing on coastal rocks
The first ID suggested by iNaturalist - since the substrate is dead poplar, starting with this.
It is shrubby, yellow-green lichen that grows in clusters of trees and rocks.
It is a slow growing species and can live for many years.
It serves as food and shelter for many species of birds and insect and it also support the ecosystem by providing information abut air quality.
They are yellowish in colour
They were spotted in small patches
These lichen were commonly found on the bark of the tree