Emerald Capsule Moss

This yellow-green moss is commonly found growing in medium-sized clumps In moorlands, On rotten logs, and In damp forests.
It is modest-sized, growing up to 5 inches (13 cm) tall. It forms in thick clumps, and is extremely hardy.
When mature, emerald circular capsules grow at the end of short, lime green sporophytes, eventually opening up during the mid-autumn to release millions of spores.