Achnanthes pyrenaica
- Peak month
- September
- Records since 2000
- 1,027
- Group
- Seaweeds and algae
Gomphonema olivaceum
- Peak month
- April
- Records since 2000
- 1,026
- Group
- Seaweeds and algae
Cylindrotheca closterium
- Peak month
- April
- Records since 2000
- 1,005
- Group
- Seaweeds and algae
Skeletonema costatum
- Peak month
- April
- Records since 2000
- 993
- Group
- Seaweeds and algae
OysterThief
- Peak month
- June
- Records since 2000
- 969
- Scientific name
- Colpomenia peregrina
Melosira varians
- Peak month
- September
- Records since 2000
- 956
- Group
- Seaweeds and algae
Synedra ulna
- Peak month
- September
- Records since 2000
- 956
- Group
- Seaweeds and algae
Taonia atomaria
- Peak month
- August
- Records since 2000
- 939
- Group
- Seaweeds and algae
Brown forking weed
- Peak month
- September
- Records since 2000
- 921
- Scientific name
- Bifurcaria bifurcata
False Pepper Dulse
- Peak month
- May
- Records since 2000
- 919
- Scientific name
- Osmundea hybrida
Pterothamnion plumula
- Peak month
- September
- Records since 2000
- 905
- Group
- Seaweeds and algae
Hildenbrandia rivularis
- Peak month
- July
- Records since 2000
- 903
- Group
- Seaweeds and algae
Eunotia exigua
- Peak month
- September
- Records since 2000
- 895
- Group
- Seaweeds and algae
Rhodymenia holmesii
- Peak month
- August
- Records since 2000
- 888
- Group
- Seaweeds and algae
Sellaphora saugerresii
- Peak month
- September
- Records since 2000
- 888
- Group
- Seaweeds and algae
Rainbow Wrack
- Peak month
- September
- Records since 2000
- 878
- Scientific name
- Ericaria selaginoides
Gomphonema minutum
- Peak month
- September
- Records since 2000
- 877
- Group
- Seaweeds and algae
Pink plates
- Peak month
- September
- Records since 2000
- 877
- Scientific name
- Mesophyllum lichenoides
False Agardhiela
- Peak month
- August
- Records since 2000
- 865
- Scientific name
- Gracilaria gracilis
Nitzschia fonticola
- Peak month
- September
- Records since 2000
- 862
- Group
- Seaweeds and algae
Phyllophora crispa
- Peak month
- August
- Records since 2000
- 862
- Group
- Seaweeds and algae
Green Sea Fern
- Peak month
- August
- Records since 2000
- 860
- Scientific name
- Bryopsis plumosa
Clawed Forked Weed
- Peak month
- September
- Records since 2000
- 857
- Scientific name
- Furcellaria lumbricalis
Red Hornweed
- Peak month
- August
- Records since 2000
- 857
- Scientific name
- Ceramium virgatum
Leptocylindrus danicus
- Peak month
- July
- Records since 2000
- 840
- Group
- Seaweeds and algae
Gomphonema exilissimum
- Peak month
- September
- Records since 2000
- 833
- Group
- Seaweeds and algae
Hannaea arcus
- Peak month
- April
- Records since 2000
- 830
- Group
- Seaweeds and algae
Kallymenia reniformis
- Peak month
- August
- Records since 2000
- 823
- Group
- Seaweeds and algae
Chondria dasyphylla
- Peak month
- August
- Records since 2000
- 819
- Group
- Seaweeds and algae
Sea Hair
- Peak month
- July
- Records since 2000
- 817
- Scientific name
- Chaetomorpha linum
Leptocylindrus minimus
- Peak month
- July
- Records since 2000
- 796
- Group
- Seaweeds and algae
Desmarestia ligulata
- Peak month
- July
- Records since 2000
- 788
- Group
- Seaweeds and algae
Apron-ribbon vegetable, Asian kelp
- Peak month
- June
- Records since 2000
- 766
- Scientific name
- Undaria pinnatifida
Nitzschia inconspicua
- Peak month
- October
- Records since 2000
- 756
- Group
- Seaweeds and algae
Odonthalia dentata
- Peak month
- August
- Records since 2000
- 743
- Group
- Seaweeds and algae
Halurus flosculosus
- Peak month
- August
- Records since 2000
- 737
- Group
- Seaweeds and algae
Bushy Red Weed
- Peak month
- June
- Records since 2000
- 736
- Scientific name
- Cystoclonium purpureum
Diatoma hyemalis
- Peak month
- April
- Records since 2000
- 725
- Group
- Seaweeds and algae
Purple Laver
- Peak month
- August
- Records since 2000
- 712
- Scientific name
- Porphyra umbilicalis
Laminaria ochroleuca
- Peak month
- August
- Records since 2000
- 709
- Group
- Seaweeds and algae
Diatoma vulgaris
- Peak month
- September
- Records since 2000
- 698
- Group
- Seaweeds and algae
Synedra debilis
- Peak month
- September
- Records since 2000
- 697
- Group
- Seaweeds and algae
Catenella caespitosa
- Peak month
- September
- Records since 2000
- 696
- Group
- Seaweeds and algae
Sea Mare's-tail
- Peak month
- August
- Records since 2000
- 681
- Scientific name
- Halurus equisetifolius
Nitzschia sociabilis
- Peak month
- April
- Records since 2000
- 674
- Group
- Seaweeds and algae
Rhizosolenia flaccida
- Peak month
- June
- Records since 2000
- 668
- Group
- Seaweeds and algae
Elachista fucicola
- Peak month
- July
- Records since 2000
- 649
- Group
- Seaweeds and algae
Plumaria plumosa
- Peak month
- September
- Records since 2000
- 646
- Group
- Seaweeds and algae