Emerald Heart Moss

This yellow-green moss is commonly found blanketing small areas On rotten logs.
It is big, growing up to 6 inches (15 cm) tall. It forms in large clumps, and is overwhelmingly frail.
When mature, emerald heart-shaped capsules grow at the end of short, lime green sporophytes, eventually opening up during the mid-autumn to release thousands of spores.