Phylum: Ochrophyta
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|
| Tofte | Akershus, Norway | 1 | 1 | 1 | 2016-11-25 | |
| Tofte | Akershus, Norway | 132 | 6 | 0 | 2016-11-25 | |
| Tofterøy | Vestland, Norway | 95 | 6 | 0 | 1996-11-01 | |
| Tornesvatnet | Rogaland, Norway | 12 | 5 | 0 | 1994-09-05 | |
| Torvanger/Hauge | Vestland, Norway | 66 | 6 | 0 | 1994-10-20 | |
| Torvangerfjæra | Vestland, Norway | 7 | 7 | 0 | 2002-10-08 | |
| Torvastad | Rogaland, Norway | 99 | 7 | 0 | 1995-09-21 | |
| Torvastad (Blokknr 39) | Rogaland, Norway | 279 | 7 | 0 | 1997-10-16 | |
| Torød | Vestfold, Norway | 143 | 7 | 0 | 1999-09-29 | |
| Torød | Vestfold, Norway | 169 | 7 | 0 | 1999-09-29 | |
| Tranevågen skule | Vestland, Norway | 1 | 1 | 0 | 2010-09-10 | |
| Treidene | Vestfold, Norway | 187 | 7 | 0 | 1997-10-28 | |
| Tretjønnet | Agder, Norway | 2 | 2 | 0 | 1990-06-26 | |
| Trolldalen | Telemark, Norway | 10 | 5 | 0 | 1993-09-17 | |
| Tromøy | Agder, Norway | 165 | 7 | 0 | 1997-10-14 | |
| Trytetjønnet | Buskerud, Norway | 6 | 4 | 0 | 1990-09-26 | |
| Træ | Vestland, Norway | 8 | 8 | 0 | 2002-11-07 | |
| Tungeneset | Rogaland, Norway | 351 | 7 | 0 | 1997-10-14 | |
| Tussvatnet | Nordland, Norway | 4 | 3 | 0 | 1990-06-07 | |
| Tveitavatnet | Vestland, Norway | 15 | 7 | 0 | 1991-05-23 | |
| Tveitevannet | Vestland, Norway | 2 | 2 | 0 | 1992-09-10 | |
| Tybakken/Sofienlund | Agder, Norway | 105 | 6 | 0 | 2002-09-19 | |
| Tømmervatnet | Troms, Norway | 2 | 2 | 0 | 1994-09-16 | |
| Tønsberg | Vestfold, Norway | 30 | 6 | 0 | 1999-09-30 | |
| Ulfsbakktjønn | Vestfold, Norway | 2 | 2 | 0 | 1996-09-25 | |
| Ulstein | Møre og Romsdal, Norway | 86 | 6 | 0 | 1995-10-13 | |
| Ulsteinvik | Møre og Romsdal, Norway | 170 | 6 | 0 | 1994-11-04 | |
| Ulsteinvik | Møre og Romsdal, Norway | 91 | 6 | 0 | 1995-10-17 | |
| Ulvøysund | Agder, Norway | 8 | 8 | 0 | 2014-08-27 | |
| Under fjellet | Nordland, Norway | 1 | 1 | 0 | 2017-05-15 | |
| Uten navn | Agder, Norway | 29 | 6 | 0 | 1993-10-11 | |
| Uten navn | Vestfold, Norway | 16 | 5 | 0 | 1995-09-20 | |
| Uten navn | Nordland, Norway | 79 | 6 | 0 | 1993-11-15 | |
| Uten navn | Rogaland, Norway | 24 | 6 | 0 | 1993-10-11 | |
| Uten navn | Vestfold, Norway | 228 | 7 | 0 | 1999-05-04 | |
| Uten navn | Finnmark, Norway | 30 | 6 | 0 | 1993-10-08 | |
| V. Måsane | Akershus, Norway | 48 | 11 | 0 | 1996-09-17 | |
| Valderøy | Møre og Romsdal, Norway | 217 | 7 | 0 | 1996-10-17 | |
| Valderøy | Møre og Romsdal, Norway | 196 | 6 | 0 | 1995-09-15 | |
| Valen | Vestland, Norway | 37 | 8 | 29 | 2015-08-31 | |
| Vallersund | Trøndelag, Norway | 18 | 5 | 0 | 1993-10-07 | |
| Vallø,Husvik | Vestfold, Norway | 381 | 7 | 0 | 2000-11-07 | |
| Valun,Sandvoll | Vestland, Norway | 8 | 3 | 0 | 1994-06-27 | |
| Vangsmjøsa | Innlandet, Norway | 1 | 1 | 0 | 2018-08-28 | |
| Vangsvik | Troms, Norway | 57 | 6 | 0 | 1993-09-01 | |
| Vannareid | Troms, Norway | 15 | 6 | 0 | 1993-11-16 | |
| Vannøya | Vestfold, Norway | 395 | 6 | 0 | 2005-09-28 | |
| Vanvikan | Trøndelag, Norway | 84 | 6 | 0 | 1993-10-08 | |
| Vardanes | Vestland, Norway | 37 | 6 | 0 | 1994-10-20 | |
| Vassøy | Rogaland, Norway | 189 | 7 | 0 | 1995-10-04 | |
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