Regnum Mycetoideum
   Class Hyphomycetes Fr. (1821) see Class Monilia A.Rich. (1832)
     Order Inomycetes
       Suborder Byssacei
         Byssi solidi Nees
           Byssini
             Genus Plegmatium Fr. (1819), nom. sanct., nom. dub. see Genus Phlegmatium Fr. (1819), nom. dub.