 Astraeus hygrometricus has been given a number of <unk> names that allude to its hygroscopic behavior , including the " <unk> earthstar " , the " hygroscopic earthstar " , the " barometer earthstar " , and the " water @-@ measure earthstar " . The resemblance to Geastrum species ( also known as true earthstars ) accounts for the common name " false earthstar " . The specific name is derived from the Greek words <unk> ( <unk> ) " wet " and <unk> ( <unk> ) " measure " . The German Mycological Society selected the species as their " Mushroom of the Year " in 2005 . 
