Phylum: Ochrophyta
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|
| Stordammen | Akershus, Norway | 3 | 3 | 0 | 1989-09-27 | |
| Store Bjørnevatnet | Agder, Norway | 1 | 1 | 0 | 1989-08-30 | |
| Store Lungegårdsvann | Vestland, Norway | 7 | 4 | 2 | 2016-04-22 | |
| Storebø | Vestland, Norway | 52 | 6 | 0 | 1993-10-20 | |
| Storleiret | Trøndelag, Norway | 2 | 2 | 0 | 1995-06-12 | |
| Stornes | Troms, Norway | 12 | 7 | 0 | 2000-09-12 | |
| Storvannet | Nordland, Norway | 7 | 4 | 0 | 1990-09-07 | |
| Strand | Vestfold, Norway | 47 | 7 | 0 | 1993-10-21 | |
| Strand | Nordland, Norway | 317 | 6 | 0 | 1996-09-16 | |
| Stranda | Møre og Romsdal, Norway | 53 | 6 | 0 | 1993-10-08 | |
| Strandstøa | Rogaland, Norway | 10 | 5 | 0 | 1993-11-22 | |
| Strandvik/vinnes | Vestland, Norway | 138 | 6 | 0 | 1996-10-03 | |
| Straume | Vestland, Norway | 3 | 3 | 0 | 2010-09-22 | |
| Strynebukta | Vestland, Norway | 12 | 5 | 0 | 1993-10-14 | |
| Strøno | Vestland, Norway | 142 | 6 | 0 | 1996-09-18 | |
| Stølsvika | Agder, Norway | 32 | 5 | 12 | 2013-09-02 | |
| Støre/Eigerøy | Rogaland, Norway | 1001 | 13 | 0 | 2024-10-02 | |
| Støtt | Nordland, Norway | 67 | 6 | 0 | 1996-09-20 | |
| Sula | Trøndelag, Norway | 31 | 6 | 0 | 1997-10-12 | |
| Sundkilen | Telemark, Norway | 6 | 4 | 0 | 1990-06-01 | |
| Sundsleira | Vestland, Norway | 8 | 4 | 0 | 2021-06-08 | |
| Sundøy | Nordland, Norway | 20 | 5 | 0 | 1993-10-26 | |
| Svanevatnet | Rogaland, Norway | 8 | 4 | 0 | 1991-06-18 | |
| Svartaholtjørnet | Vestland, Norway | 3 | 3 | 0 | 1991-05-23 | |
| Svartåstjern | Buskerud, Norway | 5 | 3 | 0 | 1993-06-03 | |
| Sveggøya | Møre og Romsdal, Norway | 198 | 6 | 0 | 1997-10-07 | |
| Svelvik | Buskerud, Norway | 108 | 6 | 0 | 1995-10-09 | |
| Syvdefjorden | Møre og Romsdal, Norway | 275 | 6 | 0 | 1997-10-09 | |
| Syvdefjorden | Møre og Romsdal, Norway | 401 | 7 | 0 | 1997-10-09 | |
| Sæbø | Møre og Romsdal, Norway | 100 | 11 | 0 | 2006-09-29 | |
| Sælenvannet | Vestland, Norway | 1 | 1 | 0 | 1991-05-04 | |
| Sømskilen | Agder, Norway | 256 | 6 | 0 | 1997-10-03 | |
| Søndre Jeløy | Østfold, Norway | 33 | 4 | 0 | 1993-12-07 | |
| Sør Kolnes | Rogaland, Norway | 46 | 6 | 0 | 1995-09-06 | |
| Sør-Høyholm | Nordland, Norway | 15 | 5 | 0 | 1993-09-27 | |
| Sør-Tverrfjord | Finnmark, Norway | 18 | 6 | 0 | 1994-11-04 | |
| Søreide | Vestland, Norway | 4 | 4 | 0 | 2013-06-13 | |
| Sørfinnset | Nordland, Norway | 13 | 5 | 0 | 1993-09-27 | |
| Sørvær | Finnmark, Norway | 16 | 6 | 0 | 1993-10-26 | |
| Søvik | Møre og Romsdal, Norway | 101 | 6 | 0 | 1995-09-18 | |
| Talgje | Rogaland, Norway | 40 | 5 | 0 | 2000-06-05 | |
| Tananger | Rogaland, Norway | 30 | 6 | 0 | 1994-06-21 | |
| Tangen | Vestfold, Norway | 256 | 6 | 0 | 1995-09-22 | |
| Tau | Rogaland, Norway | 10 | 5 | 0 | 1993-11-11 | |
| Teie | Vestfold, Norway | 22 | 5 | 0 | 1993-09-28 | |
| Tennfjord-fjøra | Møre og Romsdal, Norway | 223 | 6 | 0 | 1995-09-18 | |
| Tenvik | Vestfold, Norway | 342 | 7 | 0 | 1998-09-21 | |
| Testområde | Vestland, Norway | 1 | 1 | 0 | 1991-09-26 | |
| Tingvollvågen | Møre og Romsdal, Norway | 66 | 6 | 0 | 1994-09-14 | |
| Tiriholmen | Nordland, Norway | 168 | 6 | 0 | 1996-10-01 | |
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