noun
- a small flowerless plant that typically forms a low crusty, leafy, or branching growth on rocks, walls, and trees
Usage: biology
Examples
- Green lichen covered the old stone wall.
- The scientist studied different species of lichen in the forest.
- Lichen grows very slowly on bare rock surfaces.
- Orange and yellow lichen decorated the tree bark.
- Some types of lichen are used as natural dyes.
- The lichen on the roof indicated the building’s age.