Phylum: Red algae (Rhodophyta)
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|
| Storebø | Vestland, Norway | 1 | 1 | 0 | 1993-10-20 | |
| Storetveit skole | Vestland, Norway | 15 | 1 | 0 | 2018-04-12 | |
| Strand | Vestfold, Norway | 1 | 1 | 0 | 1993-10-21 | |
| Strand | Nordland, Norway | 18 | 1 | 0 | 1995-09-28 | |
| Stranda | Møre og Romsdal, Norway | 7 | 1 | 0 | 1993-10-08 | |
| Strandstøa | Rogaland, Norway | 2 | 1 | 0 | 1993-11-22 | |
| Strandvik/vinnes | Vestland, Norway | 8 | 1 | 0 | 1996-10-03 | |
| Strøno | Vestland, Norway | 6 | 1 | 0 | 1996-09-18 | |
| Stølsvika | Agder, Norway | 6 | 1 | 2 | 2013-09-02 | |
| Støre/Eigerøy | Rogaland, Norway | 148 | 4 | 0 | 2023-09-26 | |
| Sula | Trøndelag, Norway | 3 | 1 | 0 | 1997-10-12 | |
| Sundøy | Nordland, Norway | 1 | 1 | 0 | 1993-10-26 | |
| Sveggøya | Møre og Romsdal, Norway | 28 | 1 | 0 | 1997-10-07 | |
| Svelvik | Buskerud, Norway | 7 | 1 | 0 | 1995-10-09 | |
| Syvdefjorden | Møre og Romsdal, Norway | 32 | 1 | 0 | 1997-10-09 | |
| Syvdefjorden | Møre og Romsdal, Norway | 18 | 1 | 0 | 1997-10-09 | |
| Sæbø | Møre og Romsdal, Norway | 19 | 6 | 0 | 2006-09-29 | |
| Sømskilen | Agder, Norway | 11 | 1 | 0 | 1997-10-03 | |
| Søndre Jeløy | Østfold, Norway | 7 | 1 | 0 | 1993-12-07 | |
| Sør Kolnes | Rogaland, Norway | 7 | 1 | 0 | 1995-09-06 | |
| Sør-Høyholm | Nordland, Norway | 1 | 1 | 0 | 1993-09-27 | |
| Sør-Tverrfjord | Finnmark, Norway | 1 | 1 | 0 | 1994-11-04 | |
| Sørvær | Finnmark, Norway | 2 | 1 | 0 | 1993-10-26 | |
| Søvik | Møre og Romsdal, Norway | 4 | 1 | 0 | 1995-09-18 | |
| Talgje | Rogaland, Norway | 7 | 1 | 0 | 2000-06-05 | |
| Tananger | Rogaland, Norway | 3 | 1 | 0 | 1994-06-21 | |
| Tangen | Vestfold, Norway | 51 | 1 | 0 | 1995-09-22 | |
| Tau | Rogaland, Norway | 2 | 1 | 0 | 1993-11-11 | |
| Teie | Vestfold, Norway | 2 | 1 | 0 | 1993-09-28 | |
| Tennfjord-fjøra | Møre og Romsdal, Norway | 8 | 1 | 0 | 1995-09-18 | |
| Tenvik | Vestfold, Norway | 41 | 1 | 0 | 1998-09-21 | |
| Tiriholmen | Nordland, Norway | 12 | 1 | 0 | 1996-10-01 | |
| Tofte | Akershus, Norway | 27 | 2 | 0 | 2016-11-25 | |
| Tofterøy | Vestland, Norway | 7 | 1 | 0 | 1996-11-01 | |
| Torvanger/Hauge | Vestland, Norway | 1 | 1 | 0 | 1993-10-27 | |
| Torvangerfjæra | Vestland, Norway | 7 | 7 | 0 | 2002-10-08 | |
| Torvastad | Rogaland, Norway | 12 | 1 | 0 | 1995-09-21 | |
| Torvastad (Blokknr 39) | Rogaland, Norway | 3 | 1 | 0 | 1997-10-14 | |
| Torød | Vestfold, Norway | 19 | 1 | 0 | 1998-09-18 | |
| Torød | Vestfold, Norway | 33 | 1 | 0 | 1999-09-29 | |
| Treidene | Vestfold, Norway | 10 | 1 | 0 | 1996-09-17 | |
| Trolldalen | Telemark, Norway | 2 | 1 | 0 | 1993-09-17 | |
| Tromøy | Agder, Norway | 22 | 1 | 0 | 1996-09-25 | |
| Træ | Vestland, Norway | 3 | 3 | 0 | 2002-11-07 | |
| Tungeneset | Rogaland, Norway | 52 | 1 | 0 | 1997-10-14 | |
| Tybakken/Sofienlund | Agder, Norway | 10 | 1 | 0 | 2002-09-19 | |
| Tønsberg | Vestfold, Norway | 4 | 1 | 0 | 1999-09-30 | |
| Ulstein | Møre og Romsdal, Norway | 13 | 1 | 0 | 1995-10-13 | |
| Ulsteinvik | Møre og Romsdal, Norway | 4 | 1 | 0 | 1995-10-17 | |
| Ulsteinvik | Møre og Romsdal, Norway | 11 | 1 | 0 | 1994-11-04 | |
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