Emerald

This green moss is commonly found growing in giant clumps In rainy mountain ranges, In bogs, and On trees.
It is short, growing up to 1 inch (3 cm) tall. It forms in small clumps and they overwhelm an area rapidly, and is overwhelmingly sturdy.
When mature, emerald heart-shaped capsules grow at the end of elongated, lime green sporophytes, eventually opening up during the early autumn to release dozens of spores; it can cause allergic reactions.