Growing on tree trunks and branches, they will slowly spread. Lichens grow in three forms on these arboreal substrates. Some are crustose. These are in close contact with the bark; almost like paint.

Mars can host life, according to Polish researchers, after demonstrating lichen's survival under simulated Mars-like ...

Lichens are so familiar in our daily lives you may not even have noticed them. They grow almost everywhere but particularly on brickwork, stone and tree bark. You probably have some growing on ...