Phylum: Green algae (Chlorophyta)
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|
| Spildra | Nordland, Norway | 46 | 1 | 0 | 1998-10-07 | |
| Stangodden | Agder, Norway | 23 | 1 | 0 | 1993-10-17 | |
| Stathelle | Telemark, Norway | 95 | 1 | 0 | 1998-09-23 | |
| Statland | Trøndelag, Norway | 66 | 1 | 0 | 1996-06-19 | |
| Stavern | Vestfold, Norway | 28 | 1 | 0 | 2000-12-13 | |
| Stavern | Vestfold, Norway | 126 | 1 | 0 | 1999-09-29 | |
| Stavern | Vestfold, Norway | 43 | 1 | 0 | 1998-09-23 | |
| Stavsjø | Innlandet, Norway | 33 | 20 | 0 | 1993-09-24 | |
| Steglevannet | Buskerud, Norway | 3 | 3 | 0 | 1989-10-06 | |
| Steika | Vestfold, Norway | 80 | 1 | 0 | 1997-09-16 | |
| Steinsvikstranda | Møre og Romsdal, Norway | 22 | 1 | 0 | 1996-09-25 | |
| Stengelvåg | Nordland, Norway | 19 | 1 | 0 | 1995-06-08 | |
| Stokkastrand | Rogaland, Norway | 11 | 1 | 0 | 1995-10-03 | |
| Stokkavatnet | Nordland, Norway | 3 | 3 | 0 | 1990-09-18 | |
| Storavatnet | Vestland, Norway | 13 | 7 | 0 | 1993-09-02 | |
| Stord | Vestland, Norway | 11 | 1 | 0 | 1993-08-31 | |
| Stordammen | Akershus, Norway | 13 | 13 | 0 | 1989-09-27 | |
| Store Bjørnevatnet | Agder, Norway | 2 | 2 | 0 | 1989-08-30 | |
| Storebø | Vestland, Norway | 6 | 1 | 0 | 1993-10-20 | |
| Storeidvatnet | Nordland, Norway | 4 | 4 | 0 | 1998-09-07 | |
| Storetveit skole | Vestland, Norway | 15 | 1 | 0 | 2018-04-12 | |
| Storleiret | Trøndelag, Norway | 2 | 1 | 0 | 1995-06-12 | |
| Storvannet | Nordland, Norway | 5 | 3 | 0 | 1990-09-07 | |
| Strand | Vestfold, Norway | 12 | 1 | 0 | 1993-10-21 | |
| Strand | Nordland, Norway | 55 | 1 | 0 | 1996-09-16 | |
| Strand ved VBU | Innlandet, Norway | 1 | 1 | 1 | 2015-08-24 | |
| Stranda | Møre og Romsdal, Norway | 10 | 1 | 0 | 1993-10-08 | |
| Strandstøa | Rogaland, Norway | 2 | 1 | 0 | 1993-11-22 | |
| Strandvik/vinnes | Vestland, Norway | 41 | 1 | 0 | 1996-10-03 | |
| Straume | Vestland, Norway | 1 | 1 | 0 | 2010-09-22 | |
| Strynebukta | Vestland, Norway | 9 | 1 | 0 | 1993-10-14 | |
| Strøno | Vestland, Norway | 28 | 1 | 0 | 1996-09-18 | |
| Stølsvika | Agder, Norway | 13 | 1 | 7 | 2013-09-02 | |
| Støre/Eigerøy | Rogaland, Norway | 271 | 4 | 0 | 2023-09-26 | |
| Støtt | Nordland, Norway | 17 | 1 | 0 | 1996-09-20 | |
| Sula | Trøndelag, Norway | 8 | 1 | 0 | 1997-10-12 | |
| Sundkilen | Telemark, Norway | 7 | 5 | 0 | 1990-06-01 | |
| Sundsleira | Vestland, Norway | 1 | 1 | 0 | 2021-06-08 | |
| Sundøy | Nordland, Norway | 5 | 1 | 0 | 1993-10-26 | |
| 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 | |
| Sveggøya | Møre og Romsdal, Norway | 51 | 1 | 0 | 1997-10-07 | |
| Svelvik | Buskerud, Norway | 49 | 1 | 0 | 1995-10-09 | |
| Svinna | Østfold, Norway | 2 | 2 | 0 | 2002-05-30 | |
| Syvdefjorden | Møre og Romsdal, Norway | 71 | 1 | 0 | 1997-10-09 | |
| Syvdefjorden | Møre og Romsdal, Norway | 111 | 1 | 0 | 1997-10-09 | |
| Sæbø | Møre og Romsdal, Norway | 35 | 5 | 0 | 2006-09-29 | |
| Sælenvannet | Vestland, Norway | 3 | 3 | 0 | 1991-05-04 | |
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