lichen
🇺🇸
/ˈlaɪkən/
🇬🇧
/ˈlaɪkən/
A lichen is a small plant that grows on rocks, walls, and trees. It's usually grey or yellow and doesn't have flowers.
The lichen-covered rocks added an ancient feel to the forest.
覆盖着地衣的岩石给森林增添了一种古老的感觉。