“Moss grows where nothing else can grow. It grows on bricks. It grows on tree bark and roofing slate. It grows in the Arctic Circle and in the balmiest tropics; it also grows on the fur of sloths, on the backs of snails, on decaying human bones. It is a resurrection engine. A single clump of mosses can lie dormant and dry for forty years at a stretch, and then vault back again into life with a mere soaking of water.” – Elizabeth Gilbert
Ritva Sillanmäki Photography 
We see lots of moss in Wyoming but not in Arizona…too dry. I love the shots where the moss looks like little caterpillars. 🙂
no moss or that matter much rust there 🙂 yes they are nice, you can built a imaginary world in moss easily
Or from tiny mushrooms.