 Studies in the 2000s showed that several species from Asian collection sites labelled under the specific epithet hygrometricus were actually considerably variable in a number of macroscopic and microscopic characteristics . Molecular studies of the DNA sequences of the ITS region of the ribosomal DNA from a number of Astraeus specimens from around the world have helped to clarify phylogenetic relationships within the genus . Based on these results , two Asian " hygrometricus " populations have been described as new species : A. asiaticus and A. odoratus ( synonymous with Petcharat 's A. thailandicus described in 2003 ) . Preliminary DNA analyses suggests that the European A. hygrometricus described by Persoon is a different species than the North American version described by Morgan , and that the European population may be divided into two distinct phylotypes , from France and from the Mediterranean . A 2010 study identified a Japanese species , previously identified as A. hygrometricus , as genetically distinct ; it has yet to be officially named . 
 Studies in the 2000s showed that several species from Asian collection sites labelled under the specific epithet hygrometricus <a href='uninflect' title='1'><mark>were</mark></a> actually considerably variable in a number of macroscopic and microscopic characteristics . Molecular studies of the DNA sequences of the ITS region of the ribosomal DNA from a number of Astraeus specimens from around the world <a href='been_done' title='2'><mark>have</mark></a> helped to clarify phylogenetic relationships within the genus . Based on these results , two Asian " hygrometricus " populations <a href='been_done' title='3'><mark>have</mark></a> been described as new species : A. asiaticus and A. odoratus ( synonymous with Petcharat <a href='null_genetive' title='4'><mark>'s</mark></a>A. thailandicus described in 2003 ) . Preliminary DNA <a href='uninflect' title='5'><mark>analyses</mark></a> <a href='uninflect' title='6'><mark>suggests</mark></a> that the European A. hygrometricus described by Persoon is a different species than the North American version described by Morgan , and that the European population may be divided into two distinct phylotypes , from France and from the Mediterranean . A 2010 study identified a Japanese species , previously identified as A. hygrometricus , as genetically distinct ; it <a href='uninflect' title='7'><mark>has</mark></a> yet to be officially named . 
Studies in the 2000s showed that several species from Asian collection sites labelled under da specific epithet hygrometricus was actually considerably variable in a number of macroscopic and microscopic characteristics . Molecular studies of the DNA sequences of tdaITS region of the ribosomal DNA from a number of Astraeus specimens from around the world done helped to clarify phylogenetic relationships within the genus . Based on these results , two Asian " hygrometricus " populations done been described as new species : A. asiaticus and A. odoratus ( synonymous w Petcharat  A. thailandicus described in 2003 ) . Preliminary DNA analyse suggest that thdauropean A. hygrometricus described by Persoon is a different species than thedarth American version described by Morgan , and that the European population may b divided into 2 distinct phylotypes , from France and from the Mediterranean . A 2010 study identified a Japanese species , previously identified as A. hygrometricus , as genetically distinct ; it have yet to be officially named .