Gray Moss

This gray moss is commonly found growing in giant clumps In damp forests, On rotten logs, and In marshes.
It is average-sized, growing up to 6 inches (15 cm) tall. It forms in extensive patches and they spread and grow quickly, and is overwhelmingly rigid.
When mature, emerald oval-shaped capsules grow at the end of short, lime green sporophytes, eventually opening up during the early summer to release thousands of spores; it can cause severe allergic reactions.