Hermann Theodor Geyler (January 15, 1835 at Schwarzbach - 22 March 1889 at Frankfurt-am-Main) was a German botanist, specializing in paleobotany.
Schwarzbach, Brandenburg, in the Oberspreewald-Lausitz district, Brandenburg
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Černá v Pošumaví, a village in South Bohemia, known as Schwarzbach in German
In the northwest the Moosalb stream forms the border, and in the southwest, it is bounded by Gräfenstein Land.