Hydrolithon arenicolum- Hydrolithon boergesenii
- Hydrolithon boreale
- Hydrolithon breviclavium
- Hydrolithon craspedium
- Hydrolithon decipiens
- Hydrolithon farinosum
- Hydrolithon gardineri
- Hydrolithon laeve
- Hydrolithon megacystum
- Hydrolithon pellire
- Hydrolithon reinboldii
- Hydrolithon samoense
- Hydrolithon sargassi
- Hydrolithon superficiale