Heterokontophyta (Chromophyta)
| Diatoms of the Swedish West Coast | Göteborg University, Department of Marine Ecology & Marine Botany | |
| Image Gallery of Phaeophyta | University of Wisconsin-Madison, Department of Botany | |
| Image Gallery of Diatoms | ||
| Heterokontophyta | Ohio University, Environmental and Plant Biology Department | |
| Algal Images (especially diatoms) from Rex Lowe's lab | Bowling Green University, Department of Biological Sciences | |
| ANSP Algae Image Database (Diatoms) | Phycology Section, Patrick Center for Environmental Research | |
| Diatoms | Göteborg University, Department of Marine Botany | |
| Images of Piedmont Freshwater Pennate Diatoms | A. Bertoglio & G. Fucale | |
| Photos of Diatoms | Automatic Diatom Identification And Classification Project (ADIAC) |