Phylum: Green algae (Chlorophyta)
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|
| Sømskilen | Agder, Norway | 32 | 1 | 0 | 1997-10-03 | |
| Søndre Jeløy | Østfold, Norway | 17 | 1 | 0 | 1993-12-07 | |
| Sør Kolnes | Rogaland, Norway | 14 | 1 | 0 | 1995-09-06 | |
| Sør-Høyholm | Nordland, Norway | 6 | 1 | 0 | 1993-09-27 | |
| Sør-Tverrfjord | Finnmark, Norway | 5 | 1 | 0 | 1994-11-04 | |
| Søreide | Vestland, Norway | 1 | 1 | 0 | 2013-06-13 | |
| Sørfinnset | Nordland, Norway | 1 | 1 | 0 | 1993-09-27 | |
| Sørvær | Finnmark, Norway | 3 | 1 | 0 | 1993-10-26 | |
| Søvik | Møre og Romsdal, Norway | 23 | 1 | 0 | 1995-09-18 | |
| Talgje | Rogaland, Norway | 10 | 1 | 0 | 2000-06-05 | |
| Tananger | Rogaland, Norway | 11 | 1 | 0 | 1994-06-21 | |
| Tangen | Vestfold, Norway | 62 | 1 | 0 | 1995-09-22 | |
| Tau | Rogaland, Norway | 2 | 1 | 0 | 1993-11-11 | |
| Teie | Vestfold, Norway | 10 | 1 | 0 | 1993-09-28 | |
| Tennfjord-fjøra | Møre og Romsdal, Norway | 53 | 1 | 0 | 1995-09-18 | |
| Tenvik | Vestfold, Norway | 98 | 1 | 0 | 1998-09-21 | |
| Testområde | Vestland, Norway | 3 | 2 | 0 | 1991-09-26 | |
| Tingvollvågen | Møre og Romsdal, Norway | 12 | 1 | 0 | 1994-09-14 | |
| Tiriholmen | Nordland, Norway | 17 | 1 | 0 | 1996-10-01 | |
| Tjennane | Telemark, Norway | 3 | 2 | 0 | 1994-09-06 | |
| Tofte | Akershus, Norway | 50 | 2 | 0 | 2016-11-25 | |
| Tofte | Akershus, Norway | 1 | 1 | 1 | 2016-11-25 | |
| Tofterøy | Vestland, Norway | 14 | 1 | 0 | 1996-11-01 | |
| Tornesvatnet | Rogaland, Norway | 44 | 26 | 0 | 1994-09-05 | |
| Torvanger/Hauge | Vestland, Norway | 14 | 1 | 0 | 1994-10-20 | |
| Torvangerfjæra | Vestland, Norway | 4 | 4 | 0 | 2002-10-08 | |
| Torvastad | Rogaland, Norway | 29 | 1 | 0 | 1995-09-21 | |
| Torvastad (Blokknr 39) | Rogaland, Norway | 52 | 1 | 0 | 1997-10-15 | |
| Torød | Vestfold, Norway | 37 | 1 | 0 | 1999-09-29 | |
| Torød | Vestfold, Norway | 45 | 1 | 0 | 1999-09-29 | |
| Treidene | Vestfold, Norway | 39 | 1 | 0 | 1997-10-28 | |
| Tretjønnet | Agder, Norway | 14 | 14 | 0 | 1990-06-26 | |
| Trolldalen | Telemark, Norway | 2 | 1 | 0 | 1993-09-17 | |
| Tromøy | Agder, Norway | 36 | 1 | 0 | 1996-09-25 | |
| Trytetjønnet | Buskerud, Norway | 15 | 9 | 0 | 1990-09-26 | |
| Træ | Vestland, Norway | 3 | 3 | 0 | 2002-11-07 | |
| Tungeneset | Rogaland, Norway | 91 | 1 | 0 | 1997-10-14 | |
| Tussvatnet | Nordland, Norway | 2 | 1 | 0 | 1990-06-07 | |
| Tveitavatnet | Vestland, Norway | 11 | 8 | 0 | 1991-05-23 | |
| Tveitevannet | Vestland, Norway | 13 | 12 | 0 | 1992-09-10 | |
| Tybakken/Sofienlund | Agder, Norway | 39 | 1 | 0 | 2002-09-19 | |
| Tømmervatnet | Troms, Norway | 8 | 8 | 0 | 1994-09-16 | |
| Tønsberg | Vestfold, Norway | 8 | 1 | 0 | 1999-09-30 | |
| Ulfsbakktjønn | Vestfold, Norway | 10 | 10 | 0 | 1996-09-25 | |
| Ulstein | Møre og Romsdal, Norway | 14 | 1 | 0 | 1995-10-13 | |
| Ulsteinvik | Møre og Romsdal, Norway | 27 | 1 | 0 | 1995-10-17 | |
| Ulsteinvik | Møre og Romsdal, Norway | 51 | 1 | 0 | 1994-11-04 | |
| Uten navn | Rogaland, Norway | 5 | 1 | 0 | 1993-10-11 | |
| Uten navn | Vestfold, Norway | 86 | 1 | 0 | 1999-05-04 | |
| Uten navn | Agder, Norway | 9 | 1 | 0 | 1993-10-11 | |
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