Knotted Wrack

Ascophyllum nodosum

4,248Records since 2000

AugustPeak month

54Counties with records

When it is recorded

Jan101

Feb113

Mar209

Apr278

May352

Jun544

Jul463

Aug749

Sep627

Oct457

Nov132

Dec98

GBIF records by month, 2000–2025 (all years combined).

#	County	Nation	Records
1	Argyll and Bute	Scotland	240
2	Highland	Scotland	237
3	Cornwall	England	222
4	Ards and North Down	Northern Ireland	184
5	Gwynedd	Wales	178
6	Devon	England	142
7	Isle of Anglesey	Wales	103
8	Pembrokeshire	Wales	102
9	Na h-Eileanan Siar	Scotland	90
10	Somerset	England	69
11	Newry, Mourne and Down	Northern Ireland	66
12	Plymouth	England	56
13	North Yorkshire	England	52
14	Mid and East Antrim	Northern Ireland	50
15	Orkney Islands	Scotland	48

1,168 England1,169 Scotland807 Wales716 Northern Ireland

Records per county (GADM level 2) and per nation; one record can count towards several areas. 54 counties in all.

Records since 2000: 4,248
Peak month: August
Counties with records: 54
Scientific name: Ascophyllum nodosum
Also known as: free-floating knotted wrack
Group: Seaweeds and algae
NBN Atlas records since 2000: 3,619
Most recorded in: Argyll and Bute, Highland, Cornwall, Ards and North Down, Gwynedd, Devon, Isle of Anglesey, Pembrokeshire, Na h-Eileanan Siar, Somerset, Newry, Mourne and Down, Plymouth +2
Conservation designations: Biodiversity List – Northern Ireland, UK BAP priority species, Scottish Biodiversity List
Kingdom: Chromista
Phylum: Ochrophyta
Class: Phaeophyceae
Order: Fucales
Family: Fucaceae
Genus: Ascophyllum
Name with authority: Ascophyllum nodosum (L.) Le Jol.
Contributing datasets: 65