Central Taxonomic Thesaurus
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  Plantae
    Tracheophyta
           [Tracheobionta]
      Pteridophyta
            Polypodiopsida
                    Osmundales
                            Osmundaceae
                                     Aphyllocalpa
                                     Claytosmunda
                                             Claytosmunda claytoniana
                                                   [Osmunda claytoniana var. claytoniana]
                                                   [Osmunda claytoniana]
                                                   [Osmundastrum claytonianum]
                                               Claytosmunda claytoniana subsp. claytoniana
                                                     [Osmunda claytoniana f. tomentosa]
                                                     [Osmunda claytoniana var. dubia]
                                                     [Osmunda monticola]
                                     Leptopteris
                                             Leptopteris alpina
                                                   [Leptopteris laxa]
                                             Leptopteris fraseri
                                                   [Todea fraseri]
                                             Leptopteris hymenophylloides
                                             Leptopteris superba
                                                   [Todea superba]
                                             Leptopteris wilkesiana
                                     Osmunda
                                             Osmunda acuta
                                                   [Osmunda regalis var. obtusifolia]
                                             Osmunda herbacea
                                             Osmunda japonica
                                                   [Osmunda speciosa]
                                             Osmunda lancea
                                             Osmunda regalis
                                                   [Aphyllocalpa regalis]
                                                   [Osmunda capensis]
                                                   [Osmunda hilsenbergii]
                                                   [Osmunda obtusifolia]
                                                   [Osmunda palmeri]
                                                   [Osmunda plumieri]
                                                   [Osmunda regalis f. abyssinica]
                                                   [Osmunda regalis var. abyssinica]
                                                   [Osmunda regalis var. brevifolia]
                                                   [Osmunda regalis var. capensis]
                                                   [Osmunda regalis var. plumieri]
                                                   [Osmunda schelpei]
                                                   [Osmunda transvaalensis]
                                                   [Struthiopteris regalis]
                                               Osmunda regalis subsp. regalis
                                                 Osmunda regalis subvar. anomala
                                               Osmunda regalis var. japonica
                                               Osmunda regalis var. regalis
                                             Osmunda ruggii
                                             Osmunda spectabilis
                                                   [Osmunda gracilis]
                                                   [Osmunda palustris]
                                                   [Osmunda regalis f. anomala]
                                                   [Osmunda regalis f. linearis]
                                                   [Osmunda regalis f. nana]
                                                   [Osmunda regalis f. orbiculata]
                                                   [Osmunda regalis subsp. palustris]
                                                   [Osmunda regalis subsp. spectabilis]
                                                   [Osmunda regalis var. palustris]
                                                   [Osmunda regalis var. spectabilis]
                                             Osmunda spicant
                                             Osmunda vachellii
                                             Osmunda x ruggii
                                     Osmundastrum
                                             Osmundastrum cinnamomea
                                             Osmundastrum cinnamomeum
                                                   [Osmunda cinnamomea f. frondosa]
                                                   [Osmunda cinnamomea var. auriculata]
                                                   [Osmunda cinnamomea var. cinnamomea]
                                                   [Osmunda cinnamomea var. frondosa]
                                                   [Osmunda cinnamomea var. imbricata]
                                                   [Osmunda cinnamomea var. incisa]
                                                   [Osmunda cinnamomea]
                                               Osmundastrum cinnamomeum subsp. asiaticum
                                                     [Osmunda asiatica]
                                                     [Osmunda cinnamomea var. asiatica]
                                                     [Osmundastrum cinnamomeum var. fokiense]
                                               Osmundastrum cinnamomeum subsp. cinnamomeum
                                                     [Osmunda cinnamomea f. auriculata]
                                                     [Osmunda cinnamomea f. crenulata]
                                                     [Osmunda cinnamomea f. incisa]
                                                     [Osmunda cinnamomea f. latipinnula]
                                                     [Osmunda cinnamomea f. succumbens]
                                               Osmundastrum cinnamomeum var. cinnamomeum
                                               Osmundastrum cinnamomeum var. glandulosum
                                                     [Osmunda cinnamomea var. glandulosa]
                                     Plenasium
                                             Plenasium angustifolium
                                                   [Osmunda angustifolia]
                                             Plenasium banksiifolium
                                                   [Osmunda banksiifolia]
                                                   [Osmunda bromeliifolia]
                                                   [Plenasium bromeliifolium]
                                             Plenasium javanicum
                                                   [Osmunda javanica]
                                             Plenasium vachellii
                                     Todea
                                             Todea barbara
                                                   [Acrostichum barbarum]
                                                   [Osmunda barbara]
                                                   [Todea africana]
                                             Todea hymenophylloides