| Name | Author | Source | Citation | Year |
|---|---|---|---|---|
| Mastocarpus polycystis | Kützing | image | ||
| POLYCYSTIS | (F.T. Kützing) F.T. Kützing | image | ||
| POLYCYSTIS | (F.T. Kützing) Kirchner | image | ||
| POLYCYSTIS | G. Targioni-Tozzetti | image | ||
| Polycystis aeruginosa | (Kützing) Kützing | image | ||
| Polycystis aeruginosa var. major | Wittrock | image | ||
| Polycystis amethystina | Filarszky | image | ||
| Polycystis clarionensis | Setchell & Gardner | image | ||
| Polycystis clarionensis | Setchell & N.L. Gardner | Proc. Calif. Acad. Sci., ser. 4, | 22: 66, pl. 3 | 1937 |
| Polycystis elabens | (Brebisson) Kützing | image | ||
| Polycystis elongata | West & West | image | ||
| Polycystis firma | (Kützing) Rabenhorst | Fl. Eur. Alg. | 2: 53 | 1865 |
| Polycystis firma | (Kützing) Rabenhorst | image | ||
| Polycystis flos-aquae | Wittrock | image | ||
| Polycystis fuscolutea | Hansgirg | Österr. Bot. Z. | 38: 87 | 1888 |
| Polycystis glauca | (Wolle) Drouet & Daily | image | ||
| Polycystis ichthyoblabe | (Kützing) Kützing | image | ||
| Polycystis ichthyoblabe var. genuina | Kirchner | image | ||
| Polycystis ichthyoblabe var. purpurascens | Kirchner | image | ||
| Polycystis incerta | Lemmermann | ForschBer. Biol. Stat. Plön | 7: 132 | 1899 |
| Polycystis insignis | G. Beck in Beck & Zahlbruckner, | Annalen des Naturhistorischen Museums in Wien | 12: 83 | 1897 |
| Polycystis litoralis | Hansgirg in Foslie | Tromso Mus. Aarsh. | 10: 169, pl. 3: fig. 13 | 1890 |
| Polycystis marginata var. minor | Hansgirg | image | ||
| Polycystis marginata var. minor | Hansgirg | image | ||
| Polycystis ochracea | Brand | image | ||
| Polycystis packardii | Farlow | image | ||
| Polycystis packardii | Farlow ex Forti in De Toni | Syll. alg. | 5: 93 | 1907 |
| Polycystis packardii | Farlow in Packard | Amer. Nat. | 13: 702 | 1879 |
| Polycystis pallida | (Kützing) Farlow | image | ||
| Polycystis pallida | Lemmermann | image | ||
| Polycystis piscinalis | Brügger | Jahresber. Naturf. Ges. Graubündens, ser. 2, | 8: 249 | 1863 |
| Polycystis piscinalis | Brügger | image | ||
| Polycystis piscinalis var. microcystis | Brügger | image | ||
| Polycystis prasina | Wittrock in Wittrock & Nordstedt | Bot. Not. | 1879: 27, no fig. | 1879 |
| Polycystis purpurascens | A. Braun ex Rabenhorst | image | ||
| Polycystis reticulata | Lemmermann | image | ||
| Polycystis roseo-persicina | (Kützing) Gutwinski | image | ||
| Polycystis scripta | P. Richter | Hedwigia | 25: 255 | 1886 |
| Polycystis stagnalis | Lemmermann | Ber. Deutsch. Bot. Ges. | 18: 24 | 1900 |
| Polycystis violacea | Itzigsohn | image | ||
| Polycystis viridis | A. Braun in Rabenhorst | Fl. Eur. Alg. | 2: 53 | 1865 |