| 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 | Accepted |  | TRO |  | 
	
		| Hydrogonium brotheri (Renauld & Paris) Hilp. | Accepted |  | TRO |  | 
	
		| Hydrogonium cataractarum (M. Fleisch.) Hilp. | Accepted |  | TRO |  | 
	
		| Hydrogonium clavicostatum (Renauld & Cardot) Hilp. | Accepted |  | 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 | Unresolved |  | TRO |  | 
	
		| Hydrogonium dicranelloides Gangulee | Accepted |  | 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 | Accepted |  | 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. | Accepted |  | TRO |  | 
	
		| Hydrogonium hygrophilum Hilp. | Accepted |  | TRO |  | 
	
		| Hydrogonium inflexum (Duby) P.C. Chen | Accepted |  | TRO |  | 
	
		| Hydrogonium javanicum (Dozy & Molk.) Hilp. | Accepted |  | TRO |  | 
	
		| Hydrogonium laevifolium (Broth. & Yasuda) P.C. Chen | Accepted |  | TRO |  | 
	
		| Hydrogonium leucobasis (Dixon) W. Schultze-Motel | Accepted |  | TRO |  | 
	
		| Hydrogonium leucodontoides Gangulee | Accepted |  | TRO |  | 
	
		| Hydrogonium louisiadum (Broth.) W. Schultze-Motel | Accepted |  | TRO |  | 
	
		| Hydrogonium majusculum (Müll. Hal.) P.C. Chen | Accepted |  | TRO |  | 
	
		| Hydrogonium mamatkulovii Lazarenko | Accepted |  | TRO |  | 
	
		| Hydrogonium mediterraneum (Müll. Hal.) Renauld | Synonym |  | TRO |  | 
	
		| Hydrogonium mussoorianum Vohra | Accepted |  | TRO |  | 
	
		| Hydrogonium novoguineense (Broth.) P.C. Chen | Accepted |  | TRO |  | 
	
		| Hydrogonium patulifolium J. Froehl. | Accepted |  | 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 taylorii W.A. Weber | Accepted |  | TRO |  | 
	
		| Hydrogonium tisserantii (P. de la Varde) W. Schultze-Motel | Accepted |  | TRO |  | 
	
		| Hydrogonium tjibodense (M. Fleisch.) Hilp. | Synonym |  | TRO |  | 
	
		| Hydrogonium williamsii P.C. Chen | Accepted |  | TRO |  |