[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Kingdom Algae L. (1753) see [unranked] Algae
     Phylum Phaeophycota see Class Phaeophyceae Hansgirg (1886)
       Class Phaeophyceae Hansgirg (1886) - brown algae
         Order Chordariales
           Family Leathesiaceae
             Genus Petrospongium C. Nägeli ex F.T. Kützing (1858)
               1 Petrospongium berkeleyi (Grev., 1832) Nägeli ex Kützing (1858)