Species: Sea grass (Ulva intestinalis)
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|---|---|---|---|---|---|
| Arendal | Agder, Norway | 1 | 1 | 0 | 2013-03-20 | |
| Arendal | Agder, Norway | 2 | 1 | 2 | 2014-05-07 | |
| Bjellandstrand | Agder, Norway | 8 | 1 | 8 | 2016-06-08 | |
| Bjellandstrand | Agder, Norway | 1 | 1 | 1 | 2014-05-14 | |
| Bjellanstrand | Agder, Norway | 1 | 1 | 1 | 2014-05-14 | |
| Drøbak | Akershus, Norway | 6 | 1 | 2 | 2016-09-23 | |
| Drøbak | Akershus, Norway | 1 | 1 | 0 | 2004-05-04 | |
| Dusavik | Rogaland, Norway | 4 | 1 | 0 | 2023-06-02 | |
| dybdal | Agder, Norway | 2 | 1 | 2 | 2014-05-07 | |
| Dybdalstrand | Agder, Norway | 8 | 1 | 7 | 2017-09-20 | |
| Dysjalandsvågen | Rogaland, Norway | 1 | 1 | 0 | 2019-08-27 | |
| Eivindvik | Vestland, Norway | 1 | 1 | 1 | 2017-09-27 | |
| Elingaardskilen | Østfold, Norway | 1 | 1 | 0 | 1994-09-29 | |
| Fannestrandveien 98 | Møre og Romsdal, Norway | 1 | 1 | 0 | 2020-08-28 | |
| Finnfjordbotn, Trollbergan | Troms, Norway | 1 | 1 | 0 | 2013-08-28 | |
| Fjæra på Skjelnan | Troms, Norway | 6 | 1 | 0 | 2007-06-07 | |
| foldnes | Vestland, Norway | 1 | 1 | 0 | 2006-04-21 | |
| Fosslandsosen | Trøndelag, Norway | 4 | 1 | 0 | 1999-06-09 | |
| fuglvågen | Trøndelag, Norway | 3 | 1 | 0 | 2020-06-02 | |
| Grip | Møre og Romsdal, Norway | 1 | 1 | 0 | 2007-07-06 | |
| Gulelva | Møre og Romsdal, Norway | 1 | 1 | 0 | 1999-09-09 | |
| Gylteser | Vestfold, Norway | 2 | 1 | 0 | 2000-09-19 | |
| Halten | Trøndelag, Norway | 1 | 1 | 0 | 1994-06-03 | |
| Hamn, badeplassen | Vestland, Norway | 1 | 1 | 0 | 2014-05-06 | |
| Hauknesfjæra | Nordland, Norway | 4 | 1 | 0 | 2016-09-19 | |
| Herdla | Vestland, Norway | 2 | 1 | 0 | 2008-06-17 | |
| Holmenskjæret | Akershus, Norway | 3 | 1 | 0 | 2017-09-20 | |
| Håkonshella | Vestland, Norway | 9 | 1 | 3 | 2018-10-01 | |
| Håkonshellapollen | Vestland, Norway | 11 | 1 | 2 | 2020-06-09 | |
| Karlsfjæra | Vestland, Norway | 3 | 1 | 3 | 2014-10-01 | |
| Korsvik | Vestfold, Norway | 1 | 1 | 0 | 2001-05-31 | |
| Korsvik | Vestfold, Norway | 2 | 1 | 0 | 2014-09-01 | |
| Korsvika | Trøndelag, Norway | 3 | 1 | 3 | 2021-09-09 | |
| Kyrkjevika, Skjold | Rogaland, Norway | 4 | 1 | 1 | 2016-09-12 | |
| Kårtveitpollen | Vestland, Norway | 1 | 1 | 1 | 2014-09-24 | |
| Kårvåg | Møre og Romsdal, Norway | 1 | 1 | 0 | 2019-06-11 | |
| Lamøya | Vestfold, Norway | 1 | 1 | 0 | 1997-09-23 | |
| Likvik, Skjold | Rogaland, Norway | 1 | 1 | 1 | 2018-08-28 | |
| Lund-Klungset | Nordland, Norway | 1 | 1 | 0 | 2014-05-29 | |
| Melkeviken | Vestland, Norway | 4 | 1 | 0 | 2018-06-14 | |
| mortenveien | Rogaland, Norway | 1 | 1 | 0 | 2018-09-30 | |
| Mørkvedbukta, Fjæra | Nordland, Norway | 2 | 1 | 1 | 2014-10-09 | |
| Nautnes | Vestland, Norway | 1 | 1 | 0 | 2007-07-16 | |
| Nordre Eigerøy | Rogaland, Norway | 2 | 1 | 0 | 1997-06-04 | |
| pollen | Vestland, Norway | 3 | 1 | 0 | 2019-06-12 | |
| Rolfsbukta, Fornebu | Akershus, Norway | 1 | 1 | 0 | 2010-08-25 | |
| Rotvoll/Leangen fjæra | Trøndelag, Norway | 1 | 1 | 1 | 2019-08-23 | |
| Rotvollfjæra | Trøndelag, Norway | 9 | 1 | 0 | 2017-09-01 | |
| Sageneset | Vestland, Norway | 6 | 1 | 0 | 2003-09-15 | |
| Sandholna | Vestland, Norway | 1 | 1 | 0 | 2016-06-03 |