Wireweed, Japweed, Strangleweed

Sargassum muticum

3,356Records since 2000

JunePeak month

49Counties with records

When it is recorded

Jan138

Feb58

Mar183

Apr312

May443

Jun561

Jul512

Aug439

Sep367

Oct170

Nov86

Dec68

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

#	County	Nation	Records
1	Cornwall	England	344
2	Devon	England	177
3	Ards and North Down	Northern Ireland	165
4	Dorset	England	72
5	Torbay	England	70
6	Plymouth	England	57
7	Isles of Scilly	England	54
8	Pembrokeshire	Wales	52
9	Gwynedd	Wales	44
10	Newry, Mourne and Down	Northern Ireland	37
11	Isle of Anglesey	Wales	35
12	Argyll and Bute	Scotland	34
13	Causeway Coast and Glens	Northern Ireland	34
14	Dumfries and Galloway	Scotland	33
15	Isle of Wight	England	27

1,575 England178 Scotland304 Wales411 Northern Ireland

Records per county (GADM level 2) and per nation; one record can count towards several areas. 49 counties in all.

Records since 2000: 3,356
Peak month: June
Counties with records: 49
Scientific name: Sargassum muticum
Group: Seaweeds and algae
NBN Atlas records since 2000: 3,419
Most recorded in: Cornwall, Devon, Ards and North Down, Dorset, Torbay, Plymouth, Isles of Scilly, Pembrokeshire
Kingdom: Chromista
Phylum: Ochrophyta
Class: Phaeophyceae
Order: Fucales
Family: Sargassaceae
Genus: Sargassum
Name with authority: Sargassum muticum (Yendo) Fensholt
Contributing datasets: 59