Emerald Clump Moss

This green moss is commonly found growing in small clumps On trees.
It is small, growing up to 1 inch (3 cm) tall. It forms in small clumps, and is overwhelmingly strong; it is very difficult to kill.
When mature, emerald crescent-shaped capsules grow at the end of short, lime green sporophytes, eventually opening up during the early summer to release hundred of spores.