Emerald

This emerald moss is commonly found growing in tiny clumps In marshes, and In rainy mountain ranges.
It is small, growing up to 1 inch (3 cm) tall. It forms in sparse patches and they overwhelm an area rapidly, and is overwhelmingly resistant; it can easily endure flooding and draughts.
When mature, emerald oval-shaped capsules grow at the end of short, lime green sporophytes, eventually opening up during the early summer to release millions of spores; it can cause severe allergic reactions.