1. Genus Clathromorphum Foslie, 1898
2. Subfamily Mesophylloideae Athanasiadis & D.L.Ballantine, 2024
   1. Tribe Melyvonneeae Athanasiadis & D.L.Ballantine, 2024
      1. Genus Mesophyllum Me.Lemoine, 1928
3. Genus Leptophytum W.H.Adey, 1966 accepted as Phymatolithon Foslie, 1898 (synonym)

marine, fresh, terrestrial

Guiry, M.D. & Guiry, G.M. (2026). AlgaeBase. World-wide electronic publication, National University of Ireland, Galway (taxonomic information republished from AlgaeBase with permission of M.D. Guiry). Mesophyllumaceae C.W.Schneider & M.J.Wynne, 2019. Accessed through: The UK Marine Environmental Data and Information Network (2026) Marine Species of Britain, Ireland and Adjacent Seas (MSBIAS): a checklist of species derived from the UNICORN and Marine Recorder applications at: https://www.marinespecies.org/msbias/aphia.php?p=taxdetails&id=1590758 on 2026-05-20

The UK Marine Environmental Data and Information Network (2026). Marine Species of Britain, Ireland and Adjacent Seas (MSBIAS): a checklist of species derived from the UNICORN and Marine Recorder applications. Mesophyllumaceae C.W.Schneider & M.J.Wynne, 2019. Accessed at: https://marinespecies.org/msbias/aphia.php?p=taxdetails&id=1590758 on 2026-05-20

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