| Isopterygium acuminatum Bosw. | Accepted |  | TRO |  | 
	
		| Isopterygium acutifolium Ireland | Accepted |  | TRO |  | 
	
		| Isopterygium adflatum (Müll. Hal.) Paris | Accepted |  | TRO |  | 
	
		| Isopterygium afflictum (Müll. Hal.) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium affusum Mitt. | Accepted |  | TRO |  | 
	
		| Isopterygium albescens (Hook.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium albescens var. albescens | Synonym |  | TRO |  | 
	
		| Isopterygium albescens var. smallii (Sull. & Lesq.) Z. Iwats. | Accepted |  | TRO |  | 
	
		| Isopterygium albidens (Müll. Hal.) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium albulum (Müll. Hal.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium alpicola (Lindb. ex Lindb. & Arnell) Nyholm | Synonym |  | TRO |  | 
	
		| Isopterygium alstonii E.B. Bartram | Accepted |  | TRO |  | 
	
		| Isopterygium alternans Cardot | Synonym |  | TRO |  | 
	
		| Isopterygium alternans var. puteanum Cardot | Synonym |  | TRO |  | 
	
		| Isopterygium altisetum H.A. Crum & Steere | Synonym |  | TRO |  | 
	
		| Isopterygium ambiguum Cardot | Accepted |  | TRO |  | 
	
		| Isopterygium amblyocarpum (Hampe) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium ambreanum Renauld & Cardot | Accepted |  | TRO |  | 
	
		| Isopterygium ammophilum (Müll. Hal.) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium amoenum Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium andamanicum Gangulee | Accepted |  | TRO |  | 
	
		| Isopterygium anderssonii (Ångström) A. Jaeger | Synonym |  | TRO |  | 
	
		| Isopterygium angustirete (Broth.) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium annamense Broth. & Paris | Accepted |  | TRO |  | 
	
		| Isopterygium antarcticum (Mitt.) Cardot | Accepted |  | TRO |  | 
	
		| Isopterygium antsihanakense Cardot | Accepted |  | TRO |  | 
	
		| Isopterygium antunesii Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium applanatum M. Fleisch. | Accepted |  | TRO |  | 
	
		| Isopterygium appressum Renauld & Cardot | Synonym |  | TRO |  | 
	
		| Isopterygium aptychopsis (Müll. Hal.) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium aquaticum Dixon | Accepted |  | TRO |  | 
	
		| Isopterygium arachnoideum Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium araneosetum (Müll. Hal.) Paris | Accepted |  | TRO |  | 
	
		| Isopterygium argillicola (Renauld & Cardot) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium argyrocladum Besch. | Synonym |  | TRO |  | 
	
		| Isopterygium argyroleucum Besch. | Accepted |  | TRO |  | 
	
		| Isopterygium arquifolium (Bosch & Sande Lac.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium aspersum Cardot | Synonym |  | TRO |  | 
	
		| Isopterygium assamicum (Mitt.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium assimile Broth. ex Iisiba | Synonym |  | TRO |  | 
	
		| Isopterygium asymmetricum (Renauld & Cardot) Cardot | Accepted |  | TRO |  | 
	
		| Isopterygium atrotheca (Duby) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium auranticum (Müll. Hal.) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium austrodenticulatum (Renauld & Cardot) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium austropulchellum (Müll. Hal.) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium austropusillum (Müll. Hal.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium bahiensa (Müll. Hal.) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium bancanum (Sande Lac.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium banganus O'Shea | Accepted |  | TRO |  | 
	
		| Isopterygium barbieri Cardot & Copp. | Synonym |  | TRO |  | 
	
		| Isopterygium battakense M. Fleisch. | Accepted |  | TRO |  | 
	
		| Isopterygium baurii Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium bellissimum (Sakurai) Sakurai | Synonym |  | TRO |  | 
	
		| Isopterygium boivinii Besch. | Accepted |  | TRO |  | 
	
		| Isopterygium boivinii var. costatum Renauld & Cardot | Synonym |  | TRO |  | 
	
		| Isopterygium boninense Sakurai | Synonym |  | TRO |  | 
	
		| Isopterygium borneense Broth. & Herzog | Accepted |  | TRO |  | 
	
		| Isopterygium borrerianum (Spruce) Lindb. | Accepted |  | TRO |  | 
	
		| Isopterygium borrerianum var. gracilens (Austin ex Grout) H.A. Crum, Steere & L.E. Anderson | Accepted |  | TRO |  | 
	
		| Isopterygium borrerianum var. terrestre (Lindb.) H.A. Crum, Steere & L.E. Anderson | Accepted |  | TRO |  | 
	
		| Isopterygium bottinii (Breidl.) Kindb. | Accepted |  | TRO |  | 
	
		| Isopterygium brachycarpum Dixon | Synonym |  | TRO |  | 
	
		| Isopterygium brachyneuroides Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium brachyneuron (Müll. Hal.) Mitt. | Accepted |  | TRO |  | 
	
		| Isopterygium brachystelium (Hampe) Kindb. | Accepted |  | TRO |  | 
	
		| Isopterygium brasiliense (Broth.) W.R. Buck | Accepted |  | TRO |  | 
	
		| Isopterygium brassii E.B. Bartram | Accepted |  | TRO |  | 
	
		| Isopterygium brevicaudatum (Müll. Hal. ex Broth.) Paris | Synonym |  | TRO |  | 
	
		| Isopterygium brevicuspis Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium brevisetum (Hornsch.) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium bromeliophilum (Müll. Hal.) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium brownii Cardot | Accepted |  | TRO |  | 
	
		| Isopterygium byssaceum Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium byssicaule (Müll. Hal.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium byssobolax (Müll. Hal.) Paris | Accepted |  | TRO |  | 
	
		| Isopterygium cacti (Müll. Hal.) Kindb. | Accepted |  | TRO |  | 
	
		| Isopterygium callochlorum Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium candidulum (Müll. Hal.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium candidum (Müll. Hal.) A. Jaeger | Synonym |  | TRO |  | 
	
		| Isopterygium capillipes (Sande Lac.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium capitulatum Sakurai | Synonym |  | TRO |  | 
	
		| Isopterygium carpathicum (Podp.) Podp. | Synonym |  | TRO |  | 
	
		| Isopterygium catagonioides (Müll. Hal.) Paris | Synonym |  | TRO |  | 
	
		| Isopterygium cavernicola Cardot | Synonym |  | TRO |  | 
	
		| Isopterygium chalarophyllum (Müll. Hal.) Paris | Accepted |  | TRO |  | 
	
		| Isopterygium chlorosum (Hampe) Paris | Synonym |  | TRO |  | 
	
		| Isopterygium chrismarii (Müll. Hal.) Mitt. | Accepted |  | TRO |  | 
	
		| Isopterygium chryseolum Besch. | Accepted |  | TRO |  | 
	
		| Isopterygium citrinellum Renauld & Cardot | Accepted |  | TRO |  | 
	
		| Isopterygium citrinum (Hampe) Kindb. | Accepted |  | TRO |  | 
	
		| Isopterygium clandestinum (Ångström) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium clerophilum Besch. | Accepted |  | TRO |  | 
	
		| Isopterygium combae Besch. | Accepted |  | TRO |  | 
	
		| Isopterygium complanatulum (Müll. Hal.) Wager | Accepted |  | TRO |  | 
	
		| Isopterygium conangium Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium conangium var. asymmetricum Renauld & Cardot | Synonym |  | TRO |  | 
	
		| Isopterygium congoanum Dixon | Accepted |  | TRO |  | 
	
		| Isopterygium cordovense (Müll. Hal.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium courtoisii Broth. & Paris | Accepted |  | TRO |  | 
	
		| Isopterygium cratericola M. Fleisch. | Accepted |  | TRO |  | 
	
		| Isopterygium crossomitrii (Müll. Hal.) Paris | Accepted |  | TRO |  | 
	
		| Isopterygium curvicolle (Müll. Hal.) Mitt. | Accepted |  | TRO |  | 
	
		| Isopterygium cuspidifolium Cardot | Accepted |  | TRO |  | 
	
		| Isopterygium cylindraceum (Müll. Hal.) Paris | Accepted |  | TRO |  | 
	
		| Isopterygium cylindricarpum Cardot | Synonym |  | TRO |  | 
	
		| Isopterygium delicatulum (James) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium densifolium Lindb. ex Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium densifolium var. carpathicum Podp. | Synonym |  | TRO |  | 
	
		| Isopterygium densum Cardot | Synonym |  | TRO |  | 
	
		| Isopterygium deplanatiforme (Kindb.) Broth. | Synonym |  | TRO |  | 
	
		| Isopterygium deplanatum (Bruch & Schimp. ex Sull.) Mitt. | Accepted |  | TRO |  | 
	
		| Isopterygium depressum (Brid.) Mitt. | Accepted |  | TRO |  | 
	
		| Isopterygium dewevrei Renauld & Cardot | Accepted |  | TRO |  | 
	
		| Isopterygium diminutivum E.B. Bartram | Synonym |  | TRO |  | 
	
		| Isopterygium distichaceum (Mitt.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium divaricatulum (Müll. Hal. ex Hampe) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium draytonii (Sull.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium drummondii H.A. Crum, Steere & L.E. Anderson | Accepted |  | TRO |  | 
	
		| Isopterygium dubyi A. Gepp | Accepted |  | TRO |  | 
	
		| Isopterygium eberhardtii Broth. & Paris | Synonym |  | TRO |  | 
	
		| Isopterygium elegans (Brid.) Lindb. | Synonym |  | TRO |  | 
	
		| Isopterygium elegans var. longinerve (Spruce) Braithw. | Unresolved |  | TRO |  | 
	
		| Isopterygium elegans var. nanum (Jur.) A. Jaeger | Unresolved |  | TRO |  | 
	
		| Isopterygium elegantifrons Müll. Hal. | Synonym |  | TRO |  | 
	
		| Isopterygium elodes P. de la Varde | Accepted |  | TRO |  | 
	
		| Isopterygium eudorae (Sull.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium euryphyllum Cardot & Thér. | Accepted |  | TRO |  | 
	
		| Isopterygium euryphyllum var. bellissimum (Sakurai) Sakurai | Accepted |  | TRO |  | 
	
		| Isopterygium eutrypherum (Müll. Hal.) Paris | Accepted |  | TRO |  | 
	
		| Isopterygium excelsipes (Müll. Hal.) Paris | Accepted |  | TRO |  | 
	
		| Isopterygium exiguum Kindb. | Accepted |  | TRO |  | 
	
		| Isopterygium exile (Müll. Hal.) Paris | Accepted |  | TRO |  | 
	
		| Isopterygium fabroniiforme (Müll. Hal.) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium fallax M. Fleisch. | Accepted |  | TRO |  | 
	
		| Isopterygium fauriei Cardot | Accepted |  | TRO |  | 
	
		| Isopterygium fecundum Renauld & Cardot | Synonym |  | TRO |  | 
	
		| Isopterygium fernandezianum Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium filamentosum E.B. Bartram | Accepted |  | TRO |  | 
	
		| Isopterygium fissum Dixon | Accepted |  | TRO |  | 
	
		| Isopterygium fitzgeraldii (Renauld) Kindb. | Accepted |  | TRO |  | 
	
		| Isopterygium flaccidum (Sull. & Lesq.) Mitt. | Accepted |  | TRO |  | 
	
		| Isopterygium flavens (Müll. Hal.) Paris | Accepted |  | TRO |  | 
	
		| Isopterygium flaviusculum (Müll. Hal.) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium fontigenum (Müll. Hal.) W.R. Buck & R.R. Ireland | Accepted |  | TRO |  | 
	
		| Isopterygium fruticola (Müll. Hal.) Paris | Accepted |  | TRO |  | 
	
		| Isopterygium fuegianum Besch. | Synonym |  | TRO |  | 
	
		| Isopterygium fulvum (A. Jaeger) Kindb. | Synonym |  | TRO |  | 
	
		| Isopterygium gabonense Broth. & P. de la Varde | Accepted |  | TRO |  | 
	
		| Isopterygium geminum (Mitt.) Kindb. | Accepted |  | TRO |  | 
	
		| Isopterygium geophilum (Austin) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium gibbosulum (Müll. Hal.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium giraldii (Müll. Hal.) Paris | Synonym |  | TRO |  | 
	
		| Isopterygium giraldii var. punctatum Cardot | Synonym |  | TRO |  | 
	
		| Isopterygium gracile Renauld & Cardot | Accepted |  | TRO |  | 
	
		| Isopterygium gracilisetum (Hornsch. ex Schwägr.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium gracillimum Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium groutii (Cardot & Thér.) Grout | Accepted |  | TRO |  | 
	
		| Isopterygium guarapense Besch. | Accepted |  | TRO |  | 
	
		| Isopterygium guatemalense E.B. Bartram | Synonym |  | TRO |  | 
	
		| Isopterygium gunnii Broth. & Watts | Accepted |  | TRO |  | 
	
		| Isopterygium hasimotoi Sakurai | Accepted |  | TRO |  | 
	
		| Isopterygium hawaicum (Müll. Hal.) Paris | Synonym |  | TRO |  | 
	
		| Isopterygium herminieri Schimp. ex Besch. | Synonym |  | TRO |  | 
	
		| Isopterygium hisauchii S. Okamura | Accepted |  | TRO |  | 
	
		| Isopterygium homomallifolium Redf. | Accepted |  | TRO |  | 
	
		| Isopterygium hookeriophilum (Müll. Hal.) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium hospitans (Hampe) A. Jaeger | Synonym |  | TRO |  | 
	
		| Isopterygium howeanum Broth. & Watts | Accepted |  | TRO |  | 
	
		| Isopterygium hygrophilum Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium inclinatum (Müll. Hal.) Paris | Accepted |  | TRO |  | 
	
		| Isopterygium integrifolium E.B. Bartram | Synonym |  | TRO |  | 
	
		| Isopterygium intortum (P. Beauv.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium irelandii H. Rob. | Synonym |  | TRO |  | 
	
		| Isopterygium iverseni Kiaer | Synonym |  | TRO |  | 
	
		| Isopterygium ivoiriense Broth. & Thér. | Accepted |  | TRO |  | 
	
		| Isopterygium ivoreanum (Mitt.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium jamaicense (E.B. Bartram) W.R. Buck | Accepted |  | TRO |  | 
	
		| Isopterygium jamesii (Sull.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium japonicum Sakurai | Unresolved |  | TRO |  | 
	
		| Isopterygium jelinkii M. Fleisch. ex A. Gepp & E. Gepp | Accepted |  | TRO |  | 
	
		| Isopterygium kelungense Cardot | Synonym |  | TRO |  | 
	
		| Isopterygium kilimandscharicum Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium kiushiuense Broth. | Synonym |  | TRO |  | 
	
		| Isopterygium kusatsuense Besch. | Synonym |  | TRO |  | 
	
		| Isopterygium lamprophyllum (A. Jaeger) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium latebricola (Schimp.) Delogne | Synonym |  | TRO |  | 
	
		| Isopterygium latifolium Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium laxissimum Cardot | Unresolved |  | TRO |  | 
	
		| Isopterygium laxum (A. Jaeger) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium leiotheca Renauld & Cardot | Accepted |  | TRO |  | 
	
		| Isopterygium leptoblastum (Müll. Hal.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium leptomiton (Müll. Hal.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium leptoplumosum (Dusén) Cardot | Accepted |  | TRO |  | 
	
		| Isopterygium leptotapes Cardot | Synonym |  | TRO |  | 
	
		| Isopterygium leucophanes (Hampe ex Müll. Hal.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium leucophyllum (Hampe) Mitt. | Accepted |  | TRO |  | 
	
		| Isopterygium leucopsis (Müll. Hal.) Paris | Accepted |  | TRO |  | 
	
		| Isopterygium lignicola (Mitt.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium limatum (Hook. f. & Wilson) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium lioui Thér. & P. de la Varde | Accepted |  | TRO |  | 
	
		| Isopterygium lonchopelma (Müll. Hal.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium lonchopelmatum (Müll. Hal.) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium longicaule Herzog | Accepted |  | TRO |  | 
	
		| Isopterygium longipes Thér. | Accepted |  | TRO |  | 
	
		| Isopterygium longisetulum (Müll. Hal.) Paris | Accepted |  | TRO |  | 
	
		| Isopterygium longisetum Broth. | Synonym |  | TRO |  | 
	
		| Isopterygium longitheca (Mitt.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium ludovicianum (Renauld & Cardot) Cardot | Accepted |  | TRO |  | 
	
		| Isopterygium luteonitens (Paris) Paris | Accepted |  | TRO |  | 
	
		| Isopterygium lutschianum (Broth. & Paris) Cardot | Accepted |  | TRO |  | 
	
		| Isopterygium machrisianum (H.A. Crum) Ireland | Accepted |  | TRO |  | 
	
		| Isopterygium macoense Besch. | Accepted |  | TRO |  | 
	
		| Isopterygium maebarae Sakurai | Accepted |  | TRO |  | 
	
		| Isopterygium manaosense Broth. | Synonym |  | TRO |  | 
	
		| Isopterygium maniae Renauld & Paris | Synonym |  | TRO |  | 
	
		| Isopterygium mbangae (Müll. Hal.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium meteoriaceum (Müll. Hal.) Paris | Accepted |  | TRO |  | 
	
		| Isopterygium meylanii Cardot | Accepted |  | TRO |  | 
	
		| Isopterygium micans (Sw.) Kindb. | Accepted |  | TRO |  | 
	
		| Isopterygium micans var. groutii (Cardot & Thér.) H.A. Crum, Steere & L.E. Anderson | Accepted |  | TRO |  | 
	
		| Isopterygium microplumosum (Müll. Hal.) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium microthecium Broth. & Paris | Accepted |  | TRO |  | 
	
		| Isopterygium minutifolium Cardot & Thér. | Accepted |  | TRO |  | 
	
		| Isopterygium minutirameum (Müll. Hal.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium minutirameum f. brevifolium M. Fleisch. | Synonym |  | TRO |  | 
	
		| Isopterygium minutum Renauld & Cardot | Accepted |  | TRO |  | 
	
		| Isopterygium miquelii (Sande Lac.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium miradoricum (Müll. Hal.) A. Jaeger | Synonym |  | TRO |  | 
	
		| Isopterygium molle Thér. | Accepted |  | TRO |  | 
	
		| Isopterygium molliculum (Sull.) Mitt. | Accepted |  | TRO |  | 
	
		| Isopterygium moutieri Broth. & Paris | Synonym |  | TRO |  | 
	
		| Isopterygium muellerianum (Schimp.) A. Jaeger | Synonym |  | TRO |  | 
	
		| Isopterygium mycostelium (Hampe) Kindb. | Accepted |  | TRO |  | 
	
		| Isopterygium nanoglobum (Müll. Hal.) Paris | Accepted |  | TRO |  | 
	
		| Isopterygium neckeroides Cardot | Accepted |  | TRO |  | 
	
		| Isopterygium nematocaulon (Müll. Hal.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium nematosum Broth. & Paris | Accepted |  | TRO |  | 
	
		| Isopterygium neocaledonicum Thér. | Accepted |  | TRO |  | 
	
		| Isopterygium nervatulum (Müll. Hal.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium nitentivirens Cardot | Accepted |  | TRO |  | 
	
		| Isopterygium nivescens (Broth.) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium norfolkianum (Müll. Hal.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium novae-valesiae Broth. | Synonym |  | TRO |  | 
	
		| Isopterygium novoguinense E.B. Bartram | Accepted |  | TRO |  | 
	
		| Isopterygium obtusulum Cardot | Synonym |  | TRO |  | 
	
		| Isopterygium ovalifolium Cardot | Unresolved |  | TRO |  | 
	
		| Isopterygium pallidulum (Mitt.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium palmarum (Broth.) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium paludigenum (Müll. Hal.) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium papuanum Broth. | Synonym |  | TRO |  | 
	
		| Isopterygium passaicense (Austin) Kindb. | Accepted |  | TRO |  | 
	
		| Isopterygium pedunculatum Broth. & Paris | Accepted |  | TRO |  | 
	
		| Isopterygium pendulum Dixon ex E.B. Bartram | Accepted |  | TRO |  | 
	
		| Isopterygium perchlorosum Broth. | Synonym |  | TRO |  | 
	
		| Isopterygium perminutum E.B. Bartram | Accepted |  | TRO |  | 
	
		| Isopterygium perpallidum E.B. Bartram | Accepted |  | TRO |  | 
	
		| Isopterygium perpusillum Dixon | Accepted |  | TRO |  | 
	
		| Isopterygium perrobustum Broth. | Synonym |  | TRO |  | 
	
		| Isopterygium peruvianum Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium phlyctitheca P. de la Varde | Accepted |  | TRO |  | 
	
		| Isopterygium pilicuspis Broth. | Synonym |  | TRO |  | 
	
		| Isopterygium piliferum (Sw.) Loeske | Synonym |  | TRO |  | 
	
		| Isopterygium planifolium M. Fleisch. | Accepted |  | TRO |  | 
	
		| Isopterygium planifrons Broth. & Paris | Synonym |  | TRO |  | 
	
		| Isopterygium planissimum Mitt. | Synonym |  | TRO |  | 
	
		| Isopterygium planissimum var. laxirete Thér. | Synonym |  | TRO |  | 
	
		| Isopterygium planosquarrosum (Broth.) Paris | Synonym |  | TRO |  | 
	
		| Isopterygium plumicaule (Müll. Hal.) W.R. Buck | Accepted |  | TRO |  | 
	
		| Isopterygium plumigerum Broth. | Synonym |  | TRO |  | 
	
		| Isopterygium poasense Renauld & Cardot | Synonym |  | TRO |  | 
	
		| Isopterygium podorrhizum (Renauld & Cardot) Cardot | Accepted |  | TRO |  | 
	
		| Isopterygium pohliaecarpum (Sull. & Lesq.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium praenitens Cardot | Accepted |  | TRO |  | 
	
		| Isopterygium prasiellum Besch. | Accepted |  | TRO |  | 
	
		| Isopterygium pratense (Rabenh.) Lindb. | Accepted |  | TRO |  | 
	
		| Isopterygium propaguliferum Toyama | Accepted |  | TRO |  | 
	
		| Isopterygium pseudolatebricola (Kindb.) Kindb. | Accepted |  | TRO |  | 
	
		| Isopterygium pseudosilesiacum (Schimp.) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium pseudosubulatum (Müll. Hal.) Paris | Accepted |  | TRO |  | 
	
		| Isopterygium pseudotenerum (Broth. & Kindb.) Broth. | Synonym |  | TRO |  | 
	
		| Isopterygium pulchellum (Hedw.) A. Jaeger | Synonym |  | TRO |  | 
	
		| Isopterygium pulchellum var. nitidulum (Wahlenb.) G. Roth | Unresolved |  | TRO |  | 
	
		| Isopterygium pulchellum var. sendtnerianum (Müll. Hal.) G. Roth | Unresolved |  | TRO |  | 
	
		| Isopterygium punctulatum Broth. & Wager | Accepted |  | TRO |  | 
	
		| Isopterygium pusillum Renauld & Cardot | Synonym |  | TRO |  | 
	
		| Isopterygium pygmaeocarpum (Müll. Hal.) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium pyrrhopus (Müll. Hal.) Paris | Accepted |  | TRO |  | 
	
		| Isopterygium radicans (Brid.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium radicisetum (Müll. Hal.) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium restingae (Müll. Hal.) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium restitutum (Hampe) Kindb. | Accepted |  | TRO |  | 
	
		| Isopterygium rhynchostegiocarpum (Broth. & Paris) P. Syd. | Accepted |  | TRO |  | 
	
		| Isopterygium richardsii E.B. Bartram | Accepted |  | TRO |  | 
	
		| Isopterygium robusticaule E.B. Bartram | Accepted |  | TRO |  | 
	
		| Isopterygium robustum Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium rubellum Sakurai | Accepted |  | TRO |  | 
	
		| Isopterygium rubropunctatum Sakurai | Unresolved |  | TRO |  | 
	
		| Isopterygium rubrotapes Sakurai | Unresolved |  | TRO |  | 
	
		| Isopterygium rufisetulum (Müll. Hal.) Paris | Accepted |  | TRO |  | 
	
		| Isopterygium sakuraii Broth. | Unresolved |  | TRO |  | 
	
		| Isopterygium samoanum Müll. Hal. | Accepted |  | TRO |  | 
	
		| Isopterygium saporense Besch. | Accepted |  | TRO |  | 
	
		| Isopterygium sapricola (Müll. Hal.) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium saprophilum (Müll. Hal.) Paris | Accepted |  | TRO |  | 
	
		| Isopterygium sarasinii Thér. | Accepted |  | TRO |  | 
	
		| Isopterygium saxense R.S. Williams | Accepted |  | TRO |  | 
	
		| Isopterygium scabrifolium (Broth. & Paris) P. Syd. | Synonym |  | TRO |  | 
	
		| Isopterygium scalpellifolium (Müll. Hal.) Broth. | Synonym |  | TRO |  | 
	
		| Isopterygium seligeri (Brid.) Dixon | Synonym |  | TRO |  | 
	
		| Isopterygium semicostatum Renauld & Cardot | Synonym |  | TRO |  | 
	
		| Isopterygium sericifolium Dixon | Synonym |  | TRO |  | 
	
		| Isopterygium serrulatum M. Fleisch. | Accepted |  | TRO |  | 
	
		| Isopterygium sinense Broth. & Paris | Accepted |  | TRO |  | 
	
		| Isopterygium smallii (Sull. & Lesq.) Mitt. | Accepted |  | TRO |  | 
	
		| Isopterygium splendescens (Müll. Hal.) Broth. | Synonym |  | TRO |  | 
	
		| Isopterygium splendidulum (Hornsch.) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium sprucei (Mitt.) W.R. Buck | Accepted |  | TRO |  | 
	
		| Isopterygium squamatulum (Müll. Hal.) Broth. | Synonym |  | TRO |  | 
	
		| Isopterygium stenosekos (Welw. & Duby) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium stigmocarpum (Müll. Hal.) Paris | Accepted |  | TRO |  | 
	
		| Isopterygium strangulatum (Hampe ex Müll. Hal.) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium streptopodium Besch. | Synonym |  | TRO |  | 
	
		| Isopterygium striatellum (Brid.) Loeske | Synonym |  | TRO |  | 
	
		| Isopterygium strictirameum Dixon | Accepted |  | TRO |  | 
	
		| Isopterygium subadnatum (Müll. Hal. & Kindb.) Kindb. | Synonym |  | TRO |  | 
	
		| Isopterygium subalbescens Broth. | Synonym |  | TRO |  | 
	
		| Isopterygium subalbidum (Sull. & Lesq.) Mitt. | Accepted |  | TRO |  | 
	
		| Isopterygium subaptychopsis Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium subarachnoideum Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium subarcuatum (Broth.) Nog. | Synonym |  | TRO |  | 
	
		| Isopterygium subassimile Broth. ex Iisiba | Accepted |  | TRO |  | 
	
		| Isopterygium subbrevisetum (Hampe) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium subconangium Broth. & P. de la Varde | Accepted |  | TRO |  | 
	
		| Isopterygium subcurvicolle (Müll. Hal.) Paris | Accepted |  | TRO |  | 
	
		| Isopterygium subcylindraceum (Müll. Hal.) Paris | Unresolved |  | TRO |  | 
	
		| Isopterygium subdepressum (Hampe) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium subfalcatum (Austin) A. Jaeger | Synonym |  | TRO |  | 
	
		| Isopterygium subfulvum Broth. | Synonym |  | TRO |  | 
	
		| Isopterygium subglobosum Herzog | Accepted |  | TRO |  | 
	
		| Isopterygium subleptoblastum Müll. Hal. | Accepted |  | TRO |  | 
	
		| Isopterygium subleptotapes Cardot & P. de la Varde | Synonym |  | TRO |  | 
	
		| Isopterygium subleucopsis Broth. & Bryhn | Synonym |  | TRO |  | 
	
		| Isopterygium submammillosulum (Müll. Hal.) Paris | Synonym |  | TRO |  | 
	
		| Isopterygium submersum (Broth.) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium submicrotheca (Müll. Hal.) Mitt. | Synonym |  | TRO |  | 
	
		| Isopterygium submicrothecium Broth. & Paris | Accepted |  | TRO |  | 
	
		| Isopterygium subpinnatum (E.S. Salmon) Broth. ex Paris | Accepted |  | TRO |  | 
	
		| Isopterygium subsplendidulum (Müll. Hal.) Paris | Accepted |  | TRO |  | 
	
		| Isopterygium subtenerrimum (Müll. Hal.) Paris | Accepted |  | TRO |  | 
	
		| Isopterygium subtenerum Besch. | Accepted |  | TRO |  | 
	
		| Isopterygium subtrichopelma Renauld & Cardot | Unresolved |  | TRO |  | 
	
		| Isopterygium subverrucosum (Geh.) Paris | Synonym |  | TRO |  | 
	
		| Isopterygium sulcatum (Cardot & Thér.) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium tawadae Toyama | Unresolved |  | TRO |  | 
	
		| Isopterygium taxiforme A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium taxirameum (Mitt.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium taxithelioides Broth. & Bryhn | Accepted |  | TRO |  | 
	
		| Isopterygium taylorii Sim | Accepted |  | TRO |  | 
	
		| Isopterygium tenerifolium Mitt. | Accepted |  | TRO |  | 
	
		| Isopterygium tenerrimum (Ångström) A. Jaeger | Synonym |  | TRO |  | 
	
		| Isopterygium tenerum (Sw.) Mitt. | Accepted |  | TRO |  | 
	
		| Isopterygium teretiusculum Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium terrestre (Lindb.) Wijk & Margad. | Accepted |  | TRO |  | 
	
		| Isopterygium textorii (Sande Lac.) Mitt. | Accepted |  | TRO |  | 
	
		| Isopterygium textorii var. bellissimum Sakurai | Synonym |  | TRO |  | 
	
		| Isopterygium teysmannii (Sande Lac.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium tisserantii Broth. & P. de la Varde | Accepted |  | TRO |  | 
	
		| Isopterygium tonkinense Besch. | Accepted |  | TRO |  | 
	
		| Isopterygium tosaense Broth. | Synonym |  | TRO |  | 
	
		| Isopterygium trichopelma (Müll. Hal.) Paris | Accepted |  | TRO |  | 
	
		| Isopterygium tristaniense Dixon | Accepted |  | TRO |  | 
	
		| Isopterygium tsunodae Broth. | Synonym |  | TRO |  | 
	
		| Isopterygium turfaceum (Lindb.) Lindb. | Synonym |  | TRO |  | 
	
		| Isopterygium turfaceum subsp. pseudo-silesiacum (Schimp.) Kindb. | Synonym |  | TRO |  | 
	
		| Isopterygium turfaceum var. subsilesiacum Cardot | Synonym |  | TRO |  | 
	
		| Isopterygium undulatum Dixon & P. de la Varde | Accepted |  | TRO |  | 
	
		| Isopterygium vagans Herzog | Synonym |  | TRO |  | 
	
		| Isopterygium verruculosum (Müll. Hal.) A. Jaeger | Accepted |  | TRO |  | 
	
		| Isopterygium vestitum (Sakurai) Sakurai | Accepted |  | TRO |  | 
	
		| Isopterygium vineale E.B. Bartram | Accepted |  | TRO |  | 
	
		| Isopterygium walterianum (Hampe) Mitt. | Synonym |  | TRO |  | 
	
		| Isopterygium weigeltii (Müll. Hal.) Broth. | Accepted |  | TRO |  | 
	
		| Isopterygium welwitschii A. Gepp | Accepted |  | TRO |  | 
	
		| Isopterygium yezoanum Sakurai | Synonym |  | TRO |  | 
	
		| Isopterygium yokoskae Besch. | Synonym |  | TRO |  | 
	
		| Isopterygium yokoskae var. boninense (Sakurai) Sakurai | Unresolved |  | TRO |  |