Phylum: Ochrophyta
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|
| Skatval | Trøndelag, Norway | 6 | 6 | 6 | 2020-06-10 | |
| Skaug | Nordland, Norway | 141 | 6 | 0 | 1994-11-29 | |
| Skinnarvatnet | Agder, Norway | 1 | 1 | 0 | 2000-07-14 | |
| Skinnfelltangen | Agder, Norway | 26 | 6 | 0 | 1993-09-16 | |
| Skjebergkilen | Østfold, Norway | 116 | 6 | 0 | 1995-09-25 | |
| Skjelbreidvatnet | Vestland, Norway | 7 | 5 | 0 | 1991-06-06 | |
| Skjellvika | Vestfold, Norway | 38 | 6 | 0 | 1993-09-17 | |
| Skjernøya | Agder, Norway | 202 | 7 | 0 | 1995-09-21 | |
| Skjærvøya | Trøndelag, Norway | 79 | 6 | 0 | 1993-10-13 | |
| Skogerøya | Agder, Norway | 303 | 7 | 0 | 1997-10-02 | |
| Skoklefald | Akershus, Norway | 32 | 5 | 0 | 1993-10-13 | |
| Skottevig | Agder, Norway | 94 | 7 | 0 | 1995-10-09 | |
| Skottevik | Agder, Norway | 3 | 3 | 3 | 2013-09-19 | |
| Skånevik | Vestland, Norway | 208 | 6 | 0 | 1996-10-04 | |
| Skåraneset | Rogaland, Norway | 81 | 7 | 0 | 1995-10-02 | |
| Skåtøy | Telemark, Norway | 7 | 4 | 0 | 1995-01-02 | |
| Slagen | Vestfold, Norway | 221 | 7 | 0 | 1997-09-25 | |
| Slemmestad | Akershus, Norway | 54 | 6 | 0 | 1996-09-16 | |
| Slidrefjorden | Innlandet, Norway | 1 | 1 | 0 | 2012-05-16 | |
| Slåttvika | Nordland, Norway | 8 | 2 | 0 | 1994-11-30 | |
| Småvågane | Rogaland, Norway | 9 | 6 | 1 | 2016-06-10 | |
| Sola | Rogaland, Norway | 8 | 5 | 0 | 1995-09-08 | |
| Sola | Rogaland, Norway | 26 | 6 | 0 | 1995-09-08 | |
| Solastranda og Ølberg | Rogaland, Norway | 53 | 6 | 0 | 2005-06-10 | |
| Solveig fjæra | Troms, Norway | 5 | 5 | 0 | 2017-09-01 | |
| Solvorn | Vestland, Norway | 6 | 4 | 0 | 1993-11-29 | |
| Songebukta | Agder, Norway | 82 | 6 | 0 | 1994-12-05 | |
| Sortland | Nordland, Norway | 207 | 6 | 0 | 1996-10-02 | |
| Spervik | Vestfold, Norway | 193 | 7 | 0 | 1997-10-09 | |
| Spildepollen | Vestland, Norway | 26 | 6 | 0 | 1996-10-18 | |
| Spildervatnet | Nordland, Norway | 10 | 5 | 0 | 1994-06-02 | |
| Spildra | Nordland, Norway | 113 | 6 | 0 | 1998-10-07 | |
| Stangodden | Agder, Norway | 70 | 6 | 0 | 1993-10-17 | |
| Stathelle | Telemark, Norway | 225 | 7 | 0 | 1998-09-23 | |
| Statland | Trøndelag, Norway | 292 | 6 | 0 | 1996-06-19 | |
| Stavern | Vestfold, Norway | 265 | 7 | 0 | 1999-09-29 | |
| Stavern | Vestfold, Norway | 147 | 6 | 0 | 1998-09-23 | |
| Stavern | Vestfold, Norway | 84 | 6 | 0 | 2000-12-13 | |
| Stavsjø | Innlandet, Norway | 12 | 5 | 0 | 1993-09-24 | |
| Steglevannet | Buskerud, Norway | 1 | 1 | 0 | 1989-10-06 | |
| Steika | Vestfold, Norway | 177 | 7 | 0 | 1997-09-16 | |
| Steinsvikstranda | Møre og Romsdal, Norway | 138 | 6 | 0 | 1996-09-25 | |
| Stengelvåg | Nordland, Norway | 118 | 6 | 0 | 1995-06-08 | |
| Stikla | Østfold, Norway | 2 | 2 | 0 | 1994-06-08 | |
| Stokkastrand | Rogaland, Norway | 36 | 6 | 0 | 1995-10-03 | |
| Stokkavatnet | Nordland, Norway | 4 | 3 | 0 | 1990-09-18 | |
| Stokmarknes, Vesterålen | Nordland, Norway | 7 | 3 | 0 | 2014-10-23 | |
| Storavatnet | Vestland, Norway | 1 | 1 | 0 | 1991-10-20 | |
| Stord | Vestland, Norway | 52 | 6 | 0 | 1993-08-31 | |
| Stordammen | Akershus, Norway | 3 | 3 | 0 | 1989-09-27 | |
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