AlgaeBase Taxonomic Thesaurus
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  Chromista
      Heterokontophyta
            Phaeophyceae
                    Ralfsiales
                            Ralfsiaceae
                                     Basispora
                                             Basispora africana
                                     Heteroralfsia
                                             Heteroralfsia saxicola
                                                   [Gobia saxicola]
                                                   [Saundersella saxicola]
                                     Jonssonia
                                             Jonssonia pulvinata
                                     Lithoderma
                                             Lithoderma antarcticum
                                             Lithoderma fatiscens
                                                   [Ralfsia fatiscens]
                                             Lithoderma piliferum
                                               Lithoderma piliferum var. debile
                                             Lithoderma subextensum
                                               Lithoderma subextensum var. intermedia
                                     Myrionemopsis
                                             Myrionemopsis prostratum
                                     Petroderma
                                             Petroderma maculiforme
                                                   [Lithoderma lignicola]
                                                   [Lithoderma maculiforme]
                                             Petroderma steinitzii
                                             Petroderma vietnamensis
                                     Porterinema
                                           [Pseudobodanella]
                                             Porterinema fluviatile
                                                   [Porterinema marina]
                                                   [Pseudobodanella peterfii]
                                                   [Streblonema fluviatile]
                                     Pseudolithoderma
                                             Pseudolithoderma adriaticum
                                                   [Lithoderma adriaticum]
                                             Pseudolithoderma australe
                                             Pseudolithoderma extensum
                                                   [Lithoderma extensum]
                                                   [Pseudolithoderma fatiscens]
                                                   [Ralfsia extensa]
                                             Pseudolithoderma groenlandicum
                                             Pseudolithoderma moreirae
                                             Pseudolithoderma nigrum
                                             Pseudolithoderma paradoxum
                                             Pseudolithoderma roscoffense
                                             Pseudolithoderma rosenvingei
                                                   [Lithoderma rosenvingei]
                                             Pseudolithoderma subextensum
                                             Pseudolithoderma thangasseriense
                                     Ralfsia
                                             Ralfsia australis
                                             Ralfsia bornetii
                                             Ralfsia ceylanica
                                             Ralfsia confusa
                                             Ralfsia endopluroides
                                             Ralfsia fungiformis
                                                   [Fucus fungiformis]
                                                   [Ralfsia deusta]
                                                   [Zonaria deusta]
                                             Ralfsia hancockii
                                             Ralfsia hesperia
                                             Ralfsia huanghaiensis
                                             Ralfsia hyalina
                                             Ralfsia integra
                                             Ralfsia longicellularis
                                             Ralfsia lucida
                                             Ralfsia minima
                                             Ralfsia ovata
                                             Ralfsia pacifica
                                                   [Ralfsia occidentalis]
                                             Ralfsia pedicellata
                                             Ralfsia pusilla
                                                   [Stragularia pusilla]
                                             Ralfsia verrucosa
                                                   [Cruoria verrucosa]
                                                   [Ralfsia verrucosa var. cochlearum]
                                                   [Ralfsia verrucosa var. lignicola]
                                               Ralfsia verrucosa var. erythraea