Dictionary.net

• a helvella with an irregularly convoluted cap that is dark brown when young and becomes dull gray with age; the lower surface of the cap is smooth and pale gray; the stalk is thick and deeply fluted

2006 - WordNet 3.0
By Princeton University

• a helvella with an irregularly convoluted cap that is dark brown when young and becomes dull gray with age; the lower surface of the cap is smooth and pale gray; the stalk is thick and deeply fluted

2011 - English Dictionary Database
By DataStellar Co., Ltd