Results from these field studies were incorporated into Schneider 's book Flora von Magdeburg .
With Paul Ascherson ( 1834 -- 1913 ) and Ludwig Schneider ( 1809 -- 1889 ) , he took part in extended botanical excursions .
Results from these field studies were incorporated into Ludwig Schneider 's book Flora von Magdeburg .
With Paul Ascherson ( 1834 -- 1913 ) and Ludwig Schneider ( 1809 -- 1889 ) , he took part in extended botanical excursions .