| Hydrogonium afrofontanum (Müll. Hal.) Hilp. |
Accepted |
 |
TRO |
| Hydrogonium amplexifolium (Mitt.) P.C. Chen |
Accepted |
 |
TRO |
| Hydrogonium anceps (Cardot) Herzog & Nog. |
Accepted |
 |
TRO |
| Hydrogonium aneitense (Broth. & Watts) W. Schultze-Motel |
Accepted |
 |
TRO |
| Hydrogonium arcuatum (Griff.) Wijk & Margad. |
Accepted |
 |
TRO |
| Hydrogonium bolleanum (Müll. Hal.) A. Jaeger |
Synonym |
 |
TRO |
| Hydrogonium bollei Müll. Hal. ex Kindb. |
Unresolved |
 |
TRO |
| Hydrogonium brotheri (Renauld & Paris) Hilp. |
Accepted |
 |
TRO |
| Hydrogonium cataractarum (M. Fleisch.) Hilp. |
Accepted |
 |
TRO |
| Hydrogonium clavicostatum (Renauld & Cardot) Hilp. |
Synonym |
 |
TRO |
| Hydrogonium comosum (Dozy & Molk.) Hilp. |
Accepted |
 |
TRO |
| Hydrogonium consanguineum (Thwaites & Mitt.) Hilp. |
Accepted |
 |
TRO |
| Hydrogonium crozalsii (H. Philib.) Podp. |
Accepted |
 |
TRO |
| Hydrogonium decolyi Gangulee |
Synonym |
 |
TRO |
| Hydrogonium dicranelloides Gangulee |
Unresolved |
 |
TRO |
| Hydrogonium dixonianum P.C. Chen |
Accepted |
 |
TRO |
| Hydrogonium dorrii (Renauld & Cardot) Hilp. |
Accepted |
 |
TRO |
| Hydrogonium ehrenbergii (Lorentz) A. Jaeger |
Accepted |
 |
TRO |
| Hydrogonium ehrenbergii var. algeriae (Müll. Hal.) Wijk & Margad. |
Accepted |
 |
TRO |
| Hydrogonium fontanum (Müll. Hal.) A. Jaeger |
Synonym |
 |
TRO |
| Hydrogonium fulvisetum Hilp. |
Unresolved |
 |
TRO |
| Hydrogonium gangeticum (Müll. Hal.) P.C. Chen |
Accepted |
 |
TRO |
| Hydrogonium gracilentum (Mitt.) P.C. Chen |
Accepted |
 |
TRO |
| Hydrogonium heterophyllum J. Froehl. |
Unresolved |
 |
TRO |
| Hydrogonium hygrophilum Hilp. |
Unresolved |
 |
TRO |
| Hydrogonium inflexum (Duby) P.C. Chen |
Accepted |
 |
TRO |
| Hydrogonium javanicum (Dozy & Molk.) Hilp. |
Accepted |
 |
TRO |
| Hydrogonium javanicum var. epapillosum (M. Fleisch.) Hilp. |
Accepted |
 |
TRO |
| Hydrogonium javanicum var. kurzii (Müll. Hal.) Gangulee |
Accepted |
 |
TRO |
| Hydrogonium laevifolium (Broth. & Yasuda) P.C. Chen |
Accepted |
 |
TRO |
| Hydrogonium leucobasis (Dixon) W. Schultze-Motel |
Accepted |
 |
TRO |
| Hydrogonium leucodontoides Gangulee |
Synonym |
 |
TRO |
| Hydrogonium louisiadum (Broth.) W. Schultze-Motel |
Accepted |
 |
TRO |
| Hydrogonium majusculum (Müll. Hal.) P.C. Chen |
Accepted |
 |
TRO |
| Hydrogonium mamatkulovii Lazarenko |
Unresolved |
 |
TRO |
| Hydrogonium mediterraneum (Müll. Hal.) Renauld |
Synonym |
 |
TRO |
| Hydrogonium mussoorianum Vohra |
Unresolved |
 |
TRO |
| Hydrogonium novoguineense (Broth.) P.C. Chen |
Accepted |
 |
TRO |
| Hydrogonium patulifolium J. Froehl. |
Unresolved |
 |
TRO |
| Hydrogonium pseudoehrenbergii (M. Fleisch.) P.C. Chen |
Accepted |
 |
TRO |
| Hydrogonium rechingeri (Broth.) W. Schultze-Motel |
Accepted |
 |
TRO |
| Hydrogonium setschwanicum (Broth.) P.C. Chen |
Accepted |
 |
TRO |
| Hydrogonium soboliferum (M. Fleisch.) Hilp. |
Accepted |
 |
TRO |
| Hydrogonium sordidum (Besch.) P.C. Chen |
Accepted |
 |
TRO |
| Hydrogonium subcomosum (Broth.) P.C. Chen |
Accepted |
 |
TRO |
| Hydrogonium subpellucidum (Mitt.) Hilp. |
Accepted |
 |
TRO |
| Hydrogonium subpellucidum var. angustifolium (Broth.) Hilp. |
Accepted |
 |
TRO |
| Hydrogonium taylorii W.A. Weber |
Unresolved |
 |
TRO |
| Hydrogonium tisserantii (P. de la Varde) W. Schultze-Motel |
Accepted |
 |
TRO |
| Hydrogonium tjibodense (M. Fleisch.) Hilp. |
Synonym |
 |
TRO |
| Hydrogonium williamsii P.C. Chen |
Synonym |
 |
TRO |