Hydrocoleum brebissonii- Hydrocoleum bremii
- Hydrocoleum calcilegum
- Hydrocoleum cantharidosmus
- Hydrocoleum caput-avis
- Hydrocoleum chalybeum
- Hydrocoleum codicola
- Hydrocoleum coeruleum
- Hydrocoleum fusco-luteum
- Hydrocoleum groesbeckianum
- Hydrocoleum hieronymii
- Hydrocoleum holdeni
- Hydrocoleum homoeotrichum
- Hydrocoleum lacustre
- Hydrocoleum lauterbachii
- Hydrocoleum lyngbyaceum
- Hydrocoleum penicillatum
- Hydrocoleum platense
- Hydrocoleum rivularioides
- Hydrocoleum rufescens
- Hydrocoleum subcrustaceum
- Hydrocoleum subhomoeotrichum
- Hydrocoleum versicolor