1. Species Ascocyclus affinis Svedelius
2. Species Ascocyclus balticus Jack
3. Species Ascocyclus dichotomus Ohta, 1973
4. Species Ascocyclus hypneae Børgesen, 1920
5. Species Ascocyclus mediterraneus Levring
6. Species Ascocyclus stenonemus Takamatsu, 1987
7. Species Ascocyclus balticus Reinke, 1889 accepted as Myrionema balticum (Reinke) Foslie, 1894
8. Species Ascocyclus conchicola Feldmann, 1935 accepted as Myrionema conchicola (Feldmann) Boudouresque, 1984
9. Species Ascocyclus distromaticus W.R.Taylor, 1937 accepted as Phycocelis foecunda Strömfelt, 1888 accepted as Myrionema foecundum (Strömfelt) Sauvageau, 1897
10. Species Ascocyclus foecundus (Strömfelt) Reinke, 1898 accepted as Phycocelis foecunda Strömfelt, 1888 accepted as Myrionema foecundum (Strömfelt) Sauvageau, 1897 (synonym)
11. Species Ascocyclus globosus (Reinke) Reinke, 1889 accepted as Microspongium globosum Reinke, 1888
12. Species Ascocyclus hispanicus Sauvageau, 1897 accepted as Chilionema hispanicum (Sauvageau) R.L.Fletcher, 1987 (synonym)
13. Species Ascocyclus islandicus Jónsson, 1903 accepted as Chilionema foecundum (Strömfelt) R.L.Fletcher, 1987 accepted as Myrionema foecundum (Strömfelt) Sauvageau, 1897
14. Species Ascocyclus liechtensternii (Hauck) Holmes & Batters, 1890 accepted as Myrionema liechtensternii Hauck, 1877
15. Species Ascocyclus magnusii Sauvageau, 1927 accepted as Myrionema magnusii (Sauvageau) Loiseaux, 1967 (synonym)
16. Species Ascocyclus major Foslie, 1891 accepted as Hecatonema terminale (Kützing) Kylin, 1937
17. Species Ascocyclus ocellatus (Kützing) Reinke, 1889 accepted as Chilionema ocellatum (Kützing) Kornmann, 1953
18. Species Ascocyclus ramosus Waern, 1952 accepted as Myrionema orbiculare J.Agardh, 1848
19. Species Ascocyclus reptans (P.L.Crouan & H.M.Crouan) Reinke, 1889 accepted as Asperococcus fistulosus (Hudson) W.J.Hooker, 1833
20. Species Ascocyclus saccharinae Cotton, 1912 accepted as Phycocelis foecunda Strömfelt, 1888 accepted as Myrionema foecundum (Strömfelt) Sauvageau, 1897 (synonym)
21. Species Ascocyclus sphaerophorus Sauvageau, 1897 accepted as Phycocelis foecunda Strömfelt, 1888 accepted as Myrionema foecundum (Strömfelt) Sauvageau, 1897 (synonym)
22. Species Ascocyclus leclancheri (Harvey) Reinke (uncertain)
23. Species Ascocyclus lichtensteinii Holmes & Batters (uncertain)
24. Species Ascocyclus magni Waern, 1952 (uncertain)
25. Species Ascocyclus magnii Waern, 1952 (uncertain)
26. Species Ascocyclus orbicularis (J.Agardh) Kjellman, 1890 (uncertain)
27. Species Ascocyclus punctiformis (Lyngbye) Batters (uncertain)

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