1. Species Iridophycus ciliatus Setchell & N.L.Gardner, 1936
2. Species Iridophycus undulosus Setchell & N.L.Gardner, 1936
3. Species Iridophycus agardhianus Setchell & N.L.Gardner, 1937 accepted as Mazzaella flaccida (Setchell & N.L.Gardner) Fredericq, 1993
4. Species Iridophycus australasicus (J.Agardh) A.H.S.Lucas & Perrin, 1947 accepted as Sarcothalia radula (Esper) Edyvane & Womersley, 1994
5. Species Iridophycus boryanus Setchell & N.L.Gardner, 1937 accepted as Mazzaella laminarioides (Bory) Fredericq, 1993
6. Species Iridophycus caespitipes Setchell & N.L.Gardner, 1936 accepted as Iridaea cordata (Turner) Bory, 1826
7. Species Iridophycus californicus (J.Agardh) E.Y.Dawson, 1945 accepted as Mazzaella californica (J.Agardh) G.De Toni, 1936 (synonym)
8. Species Iridophycus capensis (J.Agardh) Setchell & N.L.Gardner, 1936 accepted as Mazzaella capensis (J.Agardh) Fredericq, 1993
9. Species Iridophycus cordatum (Turner) Setchell & Gardner, 1937 accepted as Iridaea cordata (Turner) Bory, 1826
10. Species Iridophycus coriaceus Setchell & N.L.Gardner, 1937 accepted as Mazzaella splendens (Setchell & N.L.Gardner) Fredericq, 1994
11. Species Iridophycus cornucopiae (Postels & Ruprecht) Setchell & Gardner, 1937 accepted as Mazzaella laminarioides (Bory) Fredericq, 1993
12. Species Iridophycus crispatus (Bory de Saint-Vincent) Setchell & N.L.Gardner, 1936 accepted as Sarcothalia crispata (Bory de Saint-Vincent) Leister, 1993
13. Species Iridophycus dichotomus (J.D.Hooker & Harvey) Setchell & N.L.Gardner, 1936 accepted as Sarcothalia dichotoma (J.D.Hooker & Harvey) Leister, 1993
14. Species Iridophycus flaccidus Setchell & N.L.Gardner, 1937 accepted as Mazzaella flaccida (Setchell & N.L.Gardner) Fredericq, 1993
15. Species Iridophycus fulgens Setchell & N.L.Gardner, 1937 accepted as Mazzaella splendens subsp. fulgens (Setchell & N.L.Gardner) Hughey & Hommersand, 2010 (synonym)
16. Species Iridophycus furcatus Setchell & N.L.Gardner, 1937 accepted as Mazzaella phyllocarpa (Postels & Ruprecht) Perestenko, 1996
17. Species Iridophycus heterocarpus (Postels & Ruprecht) Setchell & N.L.Gardner, 1937 accepted as Chondrus crispus Stackhouse, 1797
18. Species Iridophycus laminarioides (Bory de Saint-Vincent) Setchell & N.L.Gardner, 1936 accepted as Mazzaella laminarioides (Bory) Fredericq, 1993 (synonym)
19. Species Iridophycus laminaroides (Bory) Setchell & Gardner, 1936 accepted as Mazzaella laminarioides (Bory) Fredericq, 1993
20. Species Iridophycus linearis Setchell & N.L.Gardner, 1937 accepted as Mazzaella linearis (Setchell & N.L.Gardner) Fredericq, 1993
21. Species Iridophycus membranaceus (J.Agardh) Setchell & N.L.Gardner, 1936 accepted as Mazzaella membranacea (J.Agardh) Fredericq, 1993 (synonym)
22. Species Iridophycus micans (Bory de Saint-Vincent) Setchell & N.L.Gardner, 1936 accepted as Iridaea cordata (Turner) Bory, 1826
23. Species Iridophycus micrococcus (Kützing) Setchell & Gardner accepted as Iridaea micrococca Kützing, 1867 (synonym)
24. Species Iridophycus obovatus (Kützing) Setchell & N.L.Gardner, 1936 accepted as Iridaea cordata (Turner) Bory, 1826
25. Species Iridophycus oregonus Doty, 1947 accepted as Mazzaella oregona (Doty) Hughey, P.C.Silva & Hommersand, 2001
26. Species Iridophycus parksii Setchell & N.L.Gardner, 1937 accepted as Mazzaella parksii (Setchell & N.L.Gardner) Hughey, P.C.Silva & Hommersand, 2001
27. Species Iridophycus parvulus (Kjellman) Setchell & Gardner, 1937 accepted as Iridaea parvula (Kjellmann) Papenfuss, 1958
28. Species Iridophycus reediae Setchell & N.L.Gardner, 1937 accepted as Mazzaella splendens (Setchell & N.L.Gardner) Fredericq, 1994
29. Species Iridophycus sanguineus Setchell & N.L.Gardner, 1937 accepted as Mazzaella sanguinea (Setchell & N.L.Gardner) Hommersand, 1994
30. Species Iridophycus sinicola Setchell & N.L.Gardner, 1937 accepted as Mazzaella splendens (Setchell & N.L.Gardner) Fredericq, 1994
31. Species Iridophycus splendens Setchell & N.L.Gardner, 1937 accepted as Mazzaella splendens (Setchell & N.L.Gardner) Fredericq, 1994
32. Species Iridophycus undulosus (Bory de Saint-Vincent) Setchell & N.L.Gardner, 1936 accepted as Iridaea undulosa Bory de Saint-Vincent, 1825
33. Species Iridophycus whidbeyanus Setchell & N.L.Gardner, 1937 accepted as Mazzaella sanguinea (Setchell & N.L.Gardner) Hommersand, 1994
34. Species Iridophycus subdichotomus Nagai, 1941 (uncertain)

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