I agree, it's moss. Most mosses are great for ground cover in shady areas. They like water. You can transplant some in a rather large area by spacing it out and it will spread and fill in. You can find different types in the woods and create a lovely moss garden of several species. It's also great to plant in the spaces between walkway stones. Again, it will spread and fill in so you don't need a whole lot of it. Just scrape some off of the rocks, be sure to get a little of the soil as well (yes, it is under there). Slap it on the bare ground under a tree where nothing else will grow and it should do just fine. I also love to feel different types of moss. Keep an eye out next time you are hiking a trail in the woods. Its a prolific plant and there are many different types. Happy hunting and good luck!