Department of Marine botany, Biological Institute, University of Oslo also have algae collections which are supplementary to the collection at the Botanical Museum.
- Specimens collected in the Oslofjord (Sundene, Klavestad, Rueness, Fredriksen & Rueness 1989).
- Specimens collected along other parts of the Norwegian coast (cand. scient.)
- Grete Rytter Hasle (Diatom collection)