Geyler was the son of Hermann Gustav and d’Adelgunde Schiller (née von Schillershausen). He studied botany at
Leipzig and
Jena and was awarded his
doctorate in 1860. From 1864 to 1867, he worked in
Basel,
Switzerland with Swiss botanist
Carl Eduard Cramer, a specialist of fossil woods. During this period, Geyler greatly expanded their collection of plants to include more than 4,000 varieties. == Works ==