Where Branched string lettuce has been recorded
GBIF occurrence records for Ulva prolifera, mapped and tabulated by country.
7,140 georeferenced occurrence records with coordinates are published for Ulva prolifera through GBIF, from 70 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
- 7,140
- Countries / areas
- 70
- Mapped locations
- 164
- Records sampled for the map
- 3,000
- Inland records omitted
- 178
- Gbif taxonkey
- 5273366
Countries and areas with the most records (GBIF)
United States of America — 1,601 records; United Kingdom of Great Britain and Northern Ireland — 894 records; Portugal — 741 records; Estonia — 633 records; Netherlands — 435 records; Sweden — 368 records; Korea, Republic of — 244 records; Denmark — 230 records; New Zealand — 229 records; Canada — 211 records; Iceland — 200 records; Faroe Islands — 189 records; Poland — 144 records; Japan — 114 records; Chinese Taipei — 107 records.
Source: GBIF Occurrence Search (taxonKey 5273366) — https://www.gbif.org/occurrence/search?taxon_key=5273366&has_coordinate=true (records CC0 / CC BY). Accessed 2026-09-23.
Marine regions with a WoRMS distribution record
Spuikom; Gulf of Mexico; Irish Exclusive economic Zone; Azores Exclusive Economic Zone; Polish Exclusive Economic Zone; North Sea; Temperate Northern Pacific; Baltic Sea; Mediterranean Sea; Temperate Southern Africa; Central Indo-Pacific; Tropical Eastern Pacific; Faroe Plateau; Arctic; Tropical Atlantic; Azores Canaries Madeira; Southern Norway; Temperate Northern Atlantic; Temperate South America; Northern Norway and Finnmark; Celtic Seas; Eastern Indo-Pacific; Saharan Upwelling; Black Sea; South and West Iceland; Temperate Australasia; South European Atlantic Shelf; Western Indo-Pacific.
Source: WoRMS distribution records (MarineRegions) — https://www.marinespecies.org/aphia.php?p=taxdetails&id=234476 (CC BY 4.0). Accessed 2026-09-23.
How to read this map
The map plots a sample of 3,000 of the 7,140 records, deduplicated to a half-degree grid, so dense areas do not merge into one blob. The sample covers 36 of the 70 countries or areas with records; the areas absent from the sample hold 347 records in total (Faroe Islands, Mexico, Barbados, Jamaica, Bermuda, South Africa, Martinique, Philippines).
178 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 5273366) — https://www.gbif.org/occurrence/search?taxon_key=5273366&has_coordinate=true (records CC0 / CC BY); WoRMS distribution records (MarineRegions) — https://www.marinespecies.org/aphia.php?p=taxdetails&id=234476 (CC BY 4.0); Natural Earth 110m basemap — https://www.naturalearthdata.com/ (public domain). Accessed 2026-09-23.
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