Klasse: Grønnalger (Chlorophyceae)
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|
| Spildervatnet | Nordland, Norway | 32 | 22 | 0 | 1994-06-02 | |
| Stavsjø | Innlandet, Norway | 33 | 20 | 0 | 1993-09-24 | |
| Steglevannet | Buskerud, Norway | 3 | 3 | 0 | 1989-10-06 | |
| Stokkavatnet | Nordland, Norway | 3 | 3 | 0 | 1990-09-18 | |
| Storavatnet | Vestland, Norway | 13 | 7 | 0 | 1993-09-02 | |
| Stordammen | Akershus, Norway | 13 | 13 | 0 | 1989-09-27 | |
| Store Bjørnevatnet | Agder, Norway | 2 | 2 | 0 | 1989-08-30 | |
| Storeidvatnet | Nordland, Norway | 3 | 3 | 0 | 1998-09-07 | |
| Storvannet | Nordland, Norway | 5 | 3 | 0 | 1990-09-07 | |
| Strand ved VBU | Innlandet, Norway | 1 | 1 | 1 | 2015-08-24 | |
| Straume | Vestland, Norway | 1 | 1 | 0 | 2010-09-22 | |
| Stølsvika | Agder, Norway | 13 | 1 | 7 | 2013-09-02 | |
| Støre/Eigerøy | Rogaland, Norway | 9 | 3 | 0 | 2015-09-21 | |
| Sundkilen | Telemark, Norway | 7 | 5 | 0 | 1990-06-01 | |
| Sundsleira | Vestland, Norway | 1 | 1 | 0 | 2021-06-08 | |
| Svanevatnet | Rogaland, Norway | 18 | 14 | 0 | 1991-06-18 | |
| Svartaholtjørnet | Vestland, Norway | 40 | 27 | 0 | 1996-09-17 | |
| Svartputten | Oslo, Norway | 1 | 1 | 0 | 2003-06-06 | |
| Svartåstjern | Buskerud, Norway | 20 | 12 | 0 | 1994-06-06 | |
| Svinna | Østfold, Norway | 1 | 1 | 0 | 2002-05-30 | |
| Sæbø | Møre og Romsdal, Norway | 16 | 4 | 0 | 2006-09-29 | |
| Sælenvannet | Vestland, Norway | 3 | 3 | 0 | 1991-05-04 | |
| Søreide | Vestland, Norway | 1 | 1 | 0 | 2013-06-13 | |
| Testområde | Vestland, Norway | 3 | 2 | 0 | 1991-09-26 | |
| Tjennane | Telemark, Norway | 3 | 2 | 0 | 1994-09-06 | |
| Tofte | Akershus, Norway | 1 | 1 | 0 | 2016-11-25 | |
| Tofte | Akershus, Norway | 1 | 1 | 1 | 2016-11-25 | |
| Tornesvatnet | Rogaland, Norway | 44 | 26 | 0 | 1994-09-05 | |
| Torvangerfjæra | Vestland, Norway | 3 | 3 | 0 | 2002-10-08 | |
| Tretjønnet | Agder, Norway | 14 | 14 | 0 | 1990-06-26 | |
| Trytetjønnet | Buskerud, Norway | 15 | 9 | 0 | 1990-09-26 | |
| Træ | Vestland, Norway | 2 | 2 | 0 | 2002-11-07 | |
| 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 | |
| Tømmervatnet | Troms, Norway | 8 | 8 | 0 | 1994-09-16 | |
| Ulfsbakktjønn | Vestfold, Norway | 10 | 10 | 0 | 1996-09-25 | |
| V. Måsane | Akershus, Norway | 13 | 2 | 0 | 1996-09-17 | |
| Valen | Vestland, Norway | 4 | 2 | 4 | 2015-08-27 | |
| Vangsmjøsa | Innlandet, Norway | 3 | 2 | 0 | 2019-09-23 | |
| Vasslivatnet | Rogaland, Norway | 4 | 4 | 0 | 1990-10-04 | |
| Vikerauntjønna | Trøndelag, Norway | 11 | 8 | 0 | 1994-09-20 | |
| Vålåsjøen | Innlandet, Norway | 17 | 13 | 0 | 1993-06-09 | |
| Øksnevadtjørna | Rogaland, Norway | 13 | 11 | 0 | 1993-10-07 | |
| Ørsjøen | Innlandet, Norway | 3 | 3 | 0 | 1994-09-22 | |
| Ørskogvika | Møre og Romsdal, Norway | 1 | 1 | 0 | 1998-09-30 | |
| Østernvannet | Akershus, Norway | 5 | 3 | 0 | 1990-08-28 | |
| Øvre Storfjordvatnet | Nordland, Norway | 33 | 22 | 0 | 1991-09-04 | |
| Ålesundsaksla | Møre og Romsdal, Norway | 2 | 2 | 0 | 1999-10-07 | |
| Årefjordstranda øst | Østfold, Norway | 1 | 1 | 0 | 2016-09-08 | |
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