Grayfern

This gray moss is commonly found growing in small clumps In bogs.
It is small, growing up to 1 inch (3 cm) tall. It forms in thin clumps and they overwhelm an area rapidly, and is very hardy.
When mature, emerald cylindrical capsules grow at the end of elongated, lime green sporophytes, eventually opening up during the early summer to release millions of spores; it does not cause any allergic reactions.