In addition to his work involving orchids, he conducted important research of diatoms, publishing the treatise "Untersuchungen über Bau und Entwicklung der Bacillariaceen (Diatomaceen)" (1871) as a result.[1]
Selected works
Der Botanische Garten der Universität Heidelberg, 1880 – The botanical garden at the University of Heidelberg.
Grundzüge einer vergleichenden morphologie der orchideen, 1882 – Principles on the comparative morphology of orchids.
Entwurf einer Natürlichen Anordnung der Orchideen, 1887 – Outline on the natural arrangement of orchids.