1. Species Fosliella chamaedoris (Foslie & M.Howe) M.Howe, 1920
2. Species Fosliella fertilis (Me.Lemoine) Segonzac, 1984
3. Species Fosliella mediterranea Feldmann, 1939
4. Species Fosliella minuta W.R.Taylor, 1945
5. Species Fosliella paschalis (M.Lemoine) Setchell & N.L.Gardner, 1930
6. Species Fosliella valida W.H.Adey & P.J.Adey, 1973
7. Species Fosliella ascripticia (Foslie) G.M.Smith, 1944 accepted as Titanoderma pustulatum (J.V.Lamouroux) Nägeli, 1858
8. Species Fosliella bermudensis (Foslie) W.R.Taylor, 1960 accepted as Lithoporella bermudensis (Foslie) W.H.Adey, 1970
9. Species Fosliella borealis (Foslie) Athanasiadis, 1996 accepted as Hydrolithon boreale (Foslie) Y.M.Chamberlain, 1994
10. Species Fosliella cruciata Bressan, 1977 accepted as Hydrolithon cruciatum (Bressan) Y.M.Chamberlain, 1994 (synonym)
11. Species Fosliella cymodoceae (Foslie) P.L.Jones & Woelkerling, 1984 accepted as Hydrolithon cymodoceae (Foslie) Penrose, 1992
12. Species Fosliella dispar (Foslie) G.M.Smith, 1944 accepted as Lithophyllum dispar (Foslie) Foslie, 1909
13. Species Fosliella farinosa (J.V.Lamouroux) M.Howe, 1920 accepted as Hydrolithon farinosum (J.V.Lamouroux) Penrose & Y.M.Chamberlain, 1993 (synonym)
14. Species Fosliella intermedia (Foslie) G.M.Smith, 1944 accepted as Titanoderma pustulatum (J.V.Lamouroux) Nägeli, 1858 (synonym)
15. Species Fosliella lejolisii (Rosanoff) M.Howe, 1920 accepted as Pneophyllum fragile Kützing, 1843 (synonym)
16. Species Fosliella limitata (Foslie) Ganesan, 1963 accepted as Pneophyllum limitatum (Foslie) Y.M.Chamberlain, 1983 (synonym)
17. Species Fosliella minutula (Foslie) Ganesan, 1964 accepted as Pneophyllum confervicola (Kützing) Y.M.Chamberlain, 1983 (synonym)
18. Species Fosliella nicholsii (Setchell & Mason) G.M.Smith, 1944 accepted as Pneophyllum nicholsii (Setchell & L.R.Mason) P.C.Silva & P.W.Gabrielson, 2004 (synonym)
19. Species Fosliella sargassi (Foslie) Athanasiadis, 1996 accepted as Hydrolithon sargassi (Foslie) Y.M.Chamberlain, 1994
20. Species Fosliella tenuis W.H.Adey & P.J.Adey, 1973 accepted as Pneophyllum coronatum (Rosanoff) Penrose, 1994 (synonym)
21. Species Fosliella zonalis (P.Crouan & H.Crouan) Feldmann, 1939 accepted as Pneophyllum zonale (P.Crouan & H.Crouan) Y.M.Chamberlain, 1983 (synonym)
22. Species Fosliella zostericola (Foslie) Segawa, 1976 accepted as Pneophyllum zostericola (Foslie) D.Fujita, 1988
23. Species Fosliella affinis (Foslie) W.R.Taylor, 1960 (uncertain)
24. Species Fosliella atlantica (Foslie) W.R.Taylor, 1960 (uncertain)
25. Species Fosliella ischiensis Boudouresque & Cinelli, 1981 (uncertain, uncertain taxonomic status subjected to verification)

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