| Osmunda abyssinica (Kuhn) A.E. Bobrov | Accepted |  | TRO | 
	
		| Osmunda adiantifolia L. | Synonym |  | TRO | 
	
		| Osmunda alata Goldie | Unresolved |  | TRO | 
	
		| Osmunda angustifolia Ching | Accepted |  | TRO | 
	
		| Osmunda asiatica (Fernald) Ohwi | Synonym |  | TRO | 
	
		| Osmunda asplenifolia Sav. | Synonym |  | TRO | 
	
		| Osmunda aurita Sw. | Synonym |  | TRO | 
	
		| Osmunda banksiifolia Pr. | Unresolved |  | TRO | 
	
		| Osmunda banksiifolia var. bromeliifolia (C. Presl) Kuhn | Unresolved |  | TRO | 
	
		| Osmunda barbara Thunb. | Unresolved |  | IPNI | 
	
		| Osmunda barbara F.Muell. | Unresolved |  | IPNI | 
	
		| Osmunda barbata R.Br. | Unresolved |  | IPNI | 
	
		| Osmunda basilaris Spreng. | Unresolved |  | IPNI | 
	
		| Osmunda bavarica Schmid in Hoppe | Unresolved |  | IPNI | 
	
		| Osmunda biformis (Benth.) Makino | Synonym |  | TRO | 
	
		| Osmunda biformis var. divisa (Makino) Makino | Synonym |  | TRO | 
	
		| Osmunda bifurcata Jacq. | Synonym |  | TRO | 
	
		| Osmunda bipinnata L. | Synonym |  | TRO | 
	
		| Osmunda biternata Savigny | Synonym |  | TRO | 
	
		| Osmunda blechnoides Zoll. | Unresolved |  | IPNI | 
	
		| Osmunda borealis Salisb. | Synonym |  | TRO | 
	
		| Osmunda brasiliensis Vell. | Unresolved |  | IPNI | 
	
		| Osmunda brayeri Watelet | Unresolved |  | IPNI | 
	
		| Osmunda bromeliifolia Ogata | Unresolved |  | TRO | 
	
		| Osmunda capensis L. | Synonym |  | TRO | 
	
		| Osmunda capensis C. Presl | Synonym |  | TRO | 
	
		| Osmunda caroliniana Walter | Unresolved |  | IPNI | 
	
		| Osmunda cervina L. | Synonym |  | TRO | 
	
		| Osmunda cicutaria Savigny | Synonym |  | TRO | 
	
		| Osmunda cinnamomea L. | Accepted |  | TRO | 
	
		| Osmunda cinnamomea var. asiatica Fernald | Synonym |  | TRO | 
	
		| Osmunda cinnamomea f. auriculata (Hopkins) Kittr. | Accepted |  | TRO | 
	
		| Osmunda cinnamomea var. auriculata Hopkins | Synonym |  | TRO | 
	
		| Osmunda cinnamomea var. fokienense Copel. | Accepted |  | TRO | 
	
		| Osmunda cinnamomea f. frondosa (Torr. & A. Gray) Britton | Accepted |  | TRO | 
	
		| Osmunda cinnamomea f. frondosa Torr. & A. Gray | Synonym |  | TRO | 
	
		| Osmunda cinnamomea var. imbricata (Kunze) Milde | Synonym |  | TRO | 
	
		| Osmunda claytoniana L. | Synonym |  | TRO | 
	
		| Osmunda claytoniana f. dubia (Grout) Clute | Unresolved |  | TRO | 
	
		| Osmunda claytoniana var. dubia Grout | Synonym |  | TRO | 
	
		| Osmunda claytoniana var. vestita Milde | Synonym |  | TRO | 
	
		| Osmunda claytoniana subsp. vestita (Milde) Á. Löve & D. Löve | Unresolved |  | TRO | 
	
		| Osmunda collina W.A.Sledge | Unresolved |  | IPNI | 
	
		| Osmunda coronaria Mull. | Synonym |  | TRO | 
	
		| Osmunda crispa L. | Synonym |  | TRO | 
	
		| Osmunda deltoidea Cav. | Synonym |  | TRO | 
	
		| Osmunda dichotoma Spreng. | Synonym |  | TRO | 
	
		| Osmunda discolor G.Forst. | Unresolved |  | IPNI | 
	
		| Osmunda dissecta Poir. | Unresolved |  | IPNI | 
	
		| Osmunda filiculifolia L. | Unresolved |  | IPNI | 
	
		| Osmunda filiformis Savigny | Synonym |  | TRO | 
	
		| Osmunda flexuosa Savigny | Synonym |  | TRO | 
	
		| Osmunda fraseri F.Muell. | Unresolved |  | IPNI | 
	
		| Osmunda fulva Cav. | Synonym |  | TRO | 
	
		| Osmunda glaucescens Link. | Unresolved |  | IPNI | 
	
		| Osmunda gracilis Link | Unresolved |  | IPNI | 
	
		| Osmunda haenkeana PRESL | Synonym |  | TRO | 
	
		| Osmunda herbacea Copel. | Unresolved |  | IPNI | 
	
		| Osmunda hilsenbergii Grev. & Hk.in Hk. | Unresolved |  | IPNI | 
	
		| Osmunda hirsuta L. | Synonym |  | TRO | 
	
		| Osmunda hirta L. | Synonym |  | TRO | 
	
		| Osmunda hugeliana PRESL | Unresolved |  | TRO | 
	
		| Osmunda humilis Cav. | Synonym |  | TRO | 
	
		| Osmunda hymenophylloides J.B.Armstr. | Unresolved |  | IPNI | 
	
		| Osmunda imbricata Kunze | Synonym |  | TRO | 
	
		| Osmunda intermedia | Unresolved |  | TRO | 
	
		| Osmunda interrupta Michx. | Unresolved |  | TRO | 
	
		| Osmunda japonica Thunb. | Accepted |  | TRO | 
	
		| Osmunda japonica Houtt. | Synonym |  | TRO | 
	
		| Osmunda japonica var. divisa (Makino) Nakai | Synonym |  | TRO | 
	
		| Osmunda japonica f. divisa (Makino) Tagawa | Accepted |  | TRO | 
	
		| Osmunda javanica Blume | Accepted |  | TRO | 
	
		| Osmunda laciniata Noronha | Unresolved |  | IPNI | 
	
		| Osmunda lancea Thunb. | Accepted |  | TRO | 
	
		| Osmunda lanceolata S.G. Gmel. | Synonym |  | TRO | 
	
		| Osmunda leptophylla Sav.in Lam. | Unresolved |  | IPNI | 
	
		| Osmunda leschenaultii Wall. | Unresolved |  | IPNI | 
	
		| Osmunda lineata Sw. | Synonym |  | TRO | 
	
		| Osmunda longifolia (C. Presl) A.E. Bobrov | Synonym |  | TRO | 
	
		| Osmunda lunaria L. | Synonym |  | TRO | 
	
		| Osmunda lunaria f. matricariifolia Retz. | Synonym |  | TRO | 
	
		| Osmunda lunata Salisb. | Unresolved |  | TRO | 
	
		| Osmunda marginalis Sav. | Synonym |  | TRO | 
	
		| Osmunda matricariae Schrank | Synonym |  | TRO | 
	
		| Osmunda matricarioides Poir. | Unresolved |  | IPNI | 
	
		| Osmunda mexicana Fée | Synonym |  | TRO | 
	
		| Osmunda mildei C. Chr. | Accepted |  | TRO | 
	
		| Osmunda monticola Wall. | Unresolved |  | TRO | 
	
		| Osmunda moorei F.Muell. | Unresolved |  | IPNI | 
	
		| Osmunda multifida S.G. Gmel. | Synonym |  | TRO | 
	
		| Osmunda nipponica Makino | Unresolved |  | TRO | 
	
		| Osmunda obliqua (Muhl.) Poir. | Synonym |  | TRO | 
	
		| Osmunda oblongifolia Cav. | Synonym |  | TRO | 
	
		| Osmunda obtusa Banks. & Sol.; | Unresolved |  | IPNI | 
	
		| Osmunda obtusifolia Kaulf. | Synonym |  | TRO | 
	
		| Osmunda oxyodon Miq. | Synonym |  | TRO | 
	
		| Osmunda palmeri A.E. Bobrov | Synonym |  | TRO | 
	
		| Osmunda palustris Schrad. | Synonym |  | TRO | 
	
		| Osmunda peltata Sw. | Synonym |  | TRO | 
	
		| Osmunda phyllitidis L. | Synonym |  | TRO | 
	
		| Osmunda pilosa Wall. ex Grev. & Hook. | Synonym |  | TRO | 
	
		| Osmunda piresii Brade | Unresolved |  | TRO | 
	
		| Osmunda plumieri Tausch | Unresolved |  | IPNI | 
	
		| Osmunda pollicina Willemet | Synonym |  | TRO | 
	
		| Osmunda polypodioides Sw. | Synonym |  | TRO | 
	
		| Osmunda presliana J. Sm. | Synonym |  | TRO | 
	
		| Osmunda procera G. Forst. | Synonym |  | TRO | 
	
		| Osmunda ramosa Roth | Unresolved |  | IPNI | 
	
		| Osmunda regalis L. | Accepted |  | TRO | 
	
		| Osmunda regalis f. abyssinica Kuhn | Synonym |  | TRO | 
	
		| Osmunda regalis var. biformis Benth. | Synonym |  | TRO | 
	
		| Osmunda regalis var. brasiliensis (Hook. & Grev.) Pic. Serm. | Synonym |  | TRO | 
	
		| Osmunda regalis var. brasiliensis (Hook. & Grev.) Kunze | Synonym |  | TRO | 
	
		| Osmunda regalis var. brevifolia Desv. | Synonym |  | TRO | 
	
		| Osmunda regalis var. capensis (C. Presl) Milde | Synonym |  | TRO | 
	
		| Osmunda regalis f. divisa Makino | Synonym |  | TRO | 
	
		| Osmunda regalis subsp. japonica (Thunb.) Á. Löve & D. Löve | Synonym |  | TRO | 
	
		| Osmunda regalis var. longifolia C. Presl | Synonym |  | TRO | 
	
		| Osmunda regalis var. obtusifolia (Kaulf.) Milde | Synonym |  | TRO | 
	
		| Osmunda regalis subsp. palustris (Schrad.) Á. Löve & D. Löve | Synonym |  | TRO | 
	
		| Osmunda regalis var. spectabilis (Willd.) A. Gray | Synonym |  | TRO | 
	
		| Osmunda reptans Banks & Sol.; Forst. | Unresolved |  | IPNI | 
	
		| Osmunda × ruggii R.M. Tryon | Unresolved |  | TRO | 
	
		| Osmunda rupestris Salisb. | Unresolved |  | IPNI | 
	
		| Osmunda rutacea Poir. | Unresolved |  | IPNI | 
	
		| Osmunda rutacea Lilj. | Unresolved |  | IPNI | 
	
		| Osmunda scandens Aubl. | Unresolved |  | TRO | 
	
		| Osmunda schelpei A.E. Bobrov | Synonym |  | TRO | 
	
		| Osmunda speciosa Wall. ex Grev. & Hook. | Unresolved |  | TRO | 
	
		| Osmunda spectabilis Willd. | Synonym |  | TRO | 
	
		| Osmunda spectabilis var. brasiliensis Hook. & Grev. | Synonym |  | TRO | 
	
		| Osmunda spectabilis var. palustris (Schrad.) C. Presl | Synonym |  | TRO | 
	
		| Osmunda spicant L. | Synonym |  | TRO | 
	
		| Osmunda spicanthus J.F.Gmel. | Unresolved |  | IPNI | 
	
		| Osmunda spicata L. | Unresolved |  | IPNI | 
	
		| Osmunda struthiopteris L. | Synonym |  | TRO | 
	
		| Osmunda superba J.B.Armstr. | Unresolved |  | IPNI | 
	
		| Osmunda tenella Cav. | Unresolved |  | IPNI | 
	
		| Osmunda ternata Thunb. | Synonym |  | TRO | 
	
		| Osmunda thurifera Sw. | Synonym |  | TRO | 
	
		| Osmunda thurifraga Bory | Unresolved |  | IPNI | 
	
		| Osmunda tomentosa Savigny | Synonym |  | TRO | 
	
		| Osmunda totta Sw. | Unresolved |  | IPNI | 
	
		| Osmunda transvaalensis A.E. Bobrov | Synonym |  | TRO | 
	
		| Osmunda trifida Jacq. | Unresolved |  | IPNI | 
	
		| Osmunda trifrons Bory | Unresolved |  | IPNI | 
	
		| Osmunda vachellii Hook. | Accepted |  | TRO | 
	
		| Osmunda verticillata L. | Synonym |  | TRO | 
	
		| Osmunda villosa Poir. | Unresolved |  | TRO | 
	
		| Osmunda virginiana L. | Synonym |  | TRO | 
	
		| Osmunda virginica L. | Unresolved |  | TRO | 
	
		| Osmunda wehrii C.N.Mill. | Unresolved |  | IPNI | 
	
		| Osmunda zeylanica L. | Synonym |  | TRO | 
	
		| Osmunda zeylanica Kunze | Synonym |  | TRO |