Phylum: Green algae (Chlorophyta)
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|
| Gandsfjord vest | Rogaland, Norway | 3 | 3 | 0 | 2000-05-10 | |
| Gandsfjorden | Rogaland, Norway | 11 | 1 | 0 | 1993-10-25 | |
| Gauselstraen | Rogaland, Norway | 6 | 1 | 0 | 1995-10-31 | |
| Geiranger | Møre og Romsdal, Norway | 2 | 1 | 0 | 1993-09-21 | |
| Giske | Møre og Romsdal, Norway | 72 | 1 | 0 | 1997-09-25 | |
| Gjelsvik | Vestland, Norway | 74 | 1 | 0 | 1996-09-19 | |
| Gjeving | Agder, Norway | 24 | 1 | 0 | 1997-10-01 | |
| Gottejord | Troms, Norway | 11 | 1 | 0 | 1993-10-26 | |
| Granavatnet | Trøndelag, Norway | 9 | 7 | 0 | 1993-08-31 | |
| Gravdalsvatnet | Vestland, Norway | 6 | 6 | 0 | 1989-09-18 | |
| Grefstadvika | Agder, Norway | 3 | 1 | 3 | 2014-09-04 | |
| Gressvik | Østfold, Norway | 16 | 1 | 0 | 1993-10-21 | |
| Grindheimsvatnet | Agder, Norway | 5 | 5 | 0 | 1989-09-19 | |
| Grip | Møre og Romsdal, Norway | 1 | 1 | 0 | 2007-07-06 | |
| Grovfjord | Troms, Norway | 47 | 1 | 0 | 2019-10-31 | |
| Gryta | Møre og Romsdal, Norway | 2 | 1 | 0 | 1998-05-05 | |
| Gulelva | Møre og Romsdal, Norway | 1 | 1 | 0 | 1999-09-09 | |
| Gullerudtjern | Buskerud, Norway | 12 | 11 | 0 | 1991-06-06 | |
| Gunnesdal/Bjørnrå | Troms, Norway | 13 | 1 | 0 | 1993-09-27 | |
| Guriskj. | Vestfold, Norway | 46 | 1 | 0 | 1998-10-14 | |
| Gylteser | Vestfold, Norway | 3 | 2 | 0 | 2000-09-19 | |
| Gåstjønna | Nordland, Norway | 7 | 7 | 0 | 1989-09-12 | |
| Haddal | Møre og Romsdal, Norway | 18 | 2 | 0 | 1997-09-26 | |
| Hafrsfjord | Rogaland, Norway | 110 | 1 | 0 | 1998-09-28 | |
| Hagland | Nordland, Norway | 8 | 1 | 0 | 1996-10-03 | |
| Halsnøy | Vestland, Norway | 45 | 1 | 0 | 1996-09-25 | |
| Halten | Trøndelag, Norway | 2 | 2 | 0 | 1994-06-03 | |
| Hamar | Innlandet, Norway | 1 | 1 | 0 | 2010-08-27 | |
| Hammervatnet | Trøndelag, Norway | 46 | 18 | 0 | 1996-10-17 | |
| Hamn, badeplassen | Vestland, Norway | 1 | 1 | 0 | 2014-05-06 | |
| Hananbukta | Østfold, Norway | 1 | 1 | 0 | 2017-08-24 | |
| Hanøy | Vestland, Norway | 24 | 1 | 0 | 1995-10-11 | |
| Haram | Møre og Romsdal, Norway | 17 | 1 | 0 | 1995-10-17 | |
| Haramsøy | Møre og Romsdal, Norway | 35 | 1 | 0 | 1994-11-04 | |
| Harestuvannet | Akershus, Norway | 24 | 17 | 0 | 2005-08-30 | |
| Harøy | Møre og Romsdal, Norway | 99 | 1 | 0 | 1998-10-30 | |
| Hauknesfjæra | Nordland, Norway | 6 | 3 | 0 | 2016-09-19 | |
| Haukvatnet | Trøndelag, Norway | 7 | 7 | 0 | 1989-09-22 | |
| Hauskjevatnet | Rogaland, Norway | 10 | 7 | 0 | 1990-05-28 | |
| Hegglandsvatnet | Vestland, Norway | 10 | 8 | 0 | 1993-06-02 | |
| Heissa | Møre og Romsdal, Norway | 22 | 1 | 0 | 1995-10-27 | |
| Helgeroafjorden | Vestfold, Norway | 1 | 1 | 0 | 1993-12-08 | |
| Hellandsjøen | Trøndelag, Norway | 14 | 1 | 0 | 1996-09-06 | |
| Hellestø/Sele | Rogaland, Norway | 6 | 1 | 0 | 1998-10-01 | |
| Helleøya | Agder, Norway | 17 | 1 | 0 | 1993-10-21 | |
| Herdla | Vestland, Norway | 8 | 4 | 0 | 2008-06-17 | |
| Herdla | Vestland, Norway | 43 | 1 | 0 | 1995-10-06 | |
| Hestvika | Trøndelag, Norway | 12 | 1 | 0 | 1995-01-02 | |
| Hetland | Rogaland, Norway | 5 | 1 | 0 | 1995-09-28 | |
| Hetlevik | Vestland, Norway | 26 | 1 | 0 | 1995-10-13 | |
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