Where Flat-tube sea lettuce has been recorded
GBIF occurrence records for Ulva linza, mapped and tabulated by country.
7,678 georeferenced occurrence records with coordinates are published for Ulva linza through GBIF, from 67 countries or marine areas. This page maps those records and lists where they come from. Occurrence records reflect where people have looked as well as where the species lives, so well-surveyed coastlines are over-represented.
- Georeferenced records
- 7,678
- Countries / areas
- 67
- Mapped locations
- 168
- Records sampled for the map
- 3,000
- Inland records omitted
- 179
- Gbif taxonkey
- 5273454
Countries and areas with the most records (GBIF)
United States of America — 1,888 records; Korea, Republic of — 1,190 records; United Kingdom of Great Britain and Northern Ireland — 955 records; Sweden — 590 records; Canada — 487 records; Japan — 408 records; Finland — 263 records; Denmark — 247 records; France — 246 records; Netherlands — 195 records; Germany — 187 records; Norway — 126 records; Faroe Islands — 111 records; Iceland — 104 records; Spain — 96 records.
Source: GBIF Occurrence Search (taxonKey 5273454) — https://www.gbif.org/occurrence/search?taxon_key=5273454&has_coordinate=true (records CC0 / CC BY). Accessed 2026-09-23.
Marine regions with a WoRMS distribution record
Belgian Exclusive Economic Zone; Gulf of Mexico; Irish Exclusive economic Zone; Azores Exclusive Economic Zone; Polish Exclusive Economic Zone; Israeli part of the Mediterranean Sea - Eastern Basin; Azores Canaries Madeira.
Source: WoRMS distribution records (MarineRegions) — https://www.marinespecies.org/aphia.php?p=taxdetails&id=234474 (CC BY 4.0). Accessed 2026-09-23.
How to read this map
The map plots a sample of 3,000 of the 7,678 records, deduplicated to a half-degree grid, so dense areas do not merge into one blob. The sample covers 38 of the 67 countries or areas with records; the areas absent from the sample hold 264 records in total (Faroe Islands, Mexico, Italy, Ghana, Puerto Rico, Bermuda, South Africa, Falkland Islands (Malvinas)).
179 records plotting inland were omitted: for a marine species those are almost always the holding institution's coordinates rather than a collection site.
Records show where the species has been observed and reported, not a modelled range.
Source: GBIF Occurrence Search (taxonKey 5273454) — https://www.gbif.org/occurrence/search?taxon_key=5273454&has_coordinate=true (records CC0 / CC BY); WoRMS distribution records (MarineRegions) — https://www.marinespecies.org/aphia.php?p=taxdetails&id=234474 (CC BY 4.0); Natural Earth 110m basemap — https://www.naturalearthdata.com/ (public domain). Accessed 2026-09-23.
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