This is the time for wildflower hikes, more to be found every single week. It is also the time where there is enough moisture and warmth in the air that mosses and lichens awake from potential dormancy and fill the world with green, or, for that matter, orange, yellow, white and black, depending on the species.
The distinction between mosses and lichens, at my pay grade, is simple. One is a plant and the other a sandwich. Or so claim the teaching materials trying to instruct grade schoolers about their environment. Mosses are multicellular organisms that are able to use photosynthesis, like any other plant. They can't transport moisture though, and thus need to stay close to the surface to absorb it.