Silverfern

This silver or black moss is commonly found growing in small clumps In heathlands, In moorlands, and On rotten logs.
It is short, growing up to 3 inches (8 cm) tall. It forms in sparse patches and they overwhelm an area rapidly, and is extremely light; it burns easily in strong sunlight.
When mature, emerald triangular capsules grow at the end of short, lime green sporophytes, eventually opening up during the mid-summer to release hundred of spores; it does not cause many allergic reactions.