National Geographic : 2006 Nov
PH OTO JO URNAL MARK W. MOFFETT Tiny Marasmius leucorotalis (above) seem to float atop threadlike stems. These mushrooms play an important part in the decomposition of the forest floor; their generic name means "to wither." Bristling clusters of cup fungi (below) are young Cookeina tricholoma. When mature, spores are shot from the cups by microscopic cannon called asci.