Names
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Onostrobus Rothwell et Stockey 2024
Onostrobus elongatus Rothwell et Stockey 2024
Orontiophyllum J.Kvaček et S.Y.Sm. 2015
Orontiophyllum austriacum (J.Kvaček et A.Herman) J.Kvaček et S.Y.Sm. 2015
Orontiophyllum grandifolium (Penh.) Stockey, G.L.Hoffman et Rothwell 2021
Orontiophyllum riggauense (Erw.Knobloch) J.Kvaček et S.Y.Sm. 2015
Orontium mackii Bogner, K.R.Johnson, Kvaček et Upchurch 2007
Orontium wolfei Bogner, K.R.Johnson, Kvaček et Upchurch 2007
Orpikania freucheni Peel 2018
Orthogonospermum Manchester, Kapgate et S.Rob. in Smith, Kapgate, Robinson, Srivastava, Benedict & Manchester 2021
Orthogonospermum patanense Manchester, Kapgate et S.Rob. in Smith, Kapgate, Robinson, Srivastava, Benedict & Manchester 2021
Osmunda macrophylla Penh. 1908
Osmunda pulchella Bomfleur, G.W.Grimm et McLoughlin 2015
Osmunda zhangpuensis Zi X.Wang et B.N.Sun in Wang, Shi, Sun, Dong, Yin & Wu 2021
Osmundopsis zunigai Coturel, Bodnar, E.M.Morel, Ganuza, Sagasti et M.Beltrán 2018
Ostryoxylon gokceadaense Akkemik 2021
Otozamites crassipinnatus Tosh.Yamada et K.Uemura 2008
Otozamites toshioensoi Tosh.Yamada, J.Legrand et H.Nishida 2018
Ottokaria biharensis Ashw.K.Srivast. 1978