| Bayerisches Landesamt für Umwelt | SEM-Photographs of Bacillariophyceae | |
| California Academy of Sciences | California Academy of Sciences Diatom Collection | |
| Centre for Ecology and Hydrology (CEH) | The Fritsch Collection of Illustrations of Freshwater Algae | |
| Humboldt-Universität Berlin (BHU) | Collection of Christian Gottfried Ehrenberg | |
| University of Göttingen, Sammlung von Algenkulturen | Picture Gallery |