Q: There is a mossy growth on the lower portion of the tree trunks in our neighborhood. It grows in circles and is in a variety of colors. Is it harmful to our trees?
A: You are describing an interesting plant called a lichen. Lichens are actually a combination of a fungus and algae. The fungus needs the algae’s photosynthesis ability to produce food. The algae needs to grow in the protection of the fungus to prevent drying out. Neither of these varieties can survive without the other.
