An educational resource dedicated mainly to the photography
and diversity of marine life that can be found in coastal waters
and intertidal areas of Great Britain and Ireland.

Green seaweed / algae images (Chlorophyta)
Chlorophyceae (Class) > Chlorocystidales (Order) > Chlorocystidaceae (Family)

Halochlorococcum moorei (N.L.Gardner) Kornmann & Sahling, 1983 - Parasitic green alga on Blidingia minima

Chlorodendrophyceae (Class) > Chlorodendrales (Order) > Chlorodendraceae (Family)

Tetraselmis marina (Cienkowski) R.E.Norris, Hori & Chihara, 1980 syn. Prasinocladus marinus - A Green alga

Chlorophyceae (Class) > Sphaeropleales (Order) > Microsporaceae (Family)

Microspora ficulinae P.J.L.Dangeard, 1932
- Algal parasite of sponge Halichondria and Ficus

Trebouxiophyceae (Class) > Prasiolales (Order) > Prasiolaceae (Family)

Prasiola calophylla (Carmichael ex Greville) Kützing, 1845
- A terrestrial algae that is often found in maritime areas

Prasiola stipitata Suhr ex Jessen, 1848
- A marine algae

Ulvophyceae (Class) > Bryopsidales (Order) > Bryopsidaceae (Family)

Bryopsis plumosa (Hudson) C.Agardh, 1823
- Evenly Branched Mossy Feather Weed

Ulvophyceae (Class) > Bryopsidales (Order) > Codiaceae (Family)

Codium adhaerens C.Agardh, 1822 - A green seaweed
Codium fragile subsp. fragile (Suringar) Hariot, 1889
- Green Sea Fingers

Codium tomentosum Stackhouse, 1797 - Velvet Horn

Ulvophyceae (Class) > Bryopsidales (Order) > Derbesiaceae (Family)

Derbesia marina (Lyngbye) Solier, 1846
- A Green seaweed

Ulvophyceae (Class) > Cladophorales (Order) > Anadyomenaceae (Family)

Anadyomene stellata (Wulfen) C.Agardh, 1823
- Common Sea Kale (non-native species)

Ulvophyceae (Class) > Cladophorales (Order) > Cladophoraceae (Family)

Chaetomorpha linum (O.F.Müller) Kützing, 1845
- Spaghetti algae

Chaetomorpha melagonium (F.Weber & Mohr) Kützing, 1845 - A Green seaweed
Chaetomorpha species Chyandour, Penzance, 21.05.15
- A Green seaweed

Cladophora albida (Nees) Kutzing, 1843 ?
- A Green Branched Weed

Cladophora pellucida ? (Hudson) Kützing, 1843
- A Green Branched Weed

Cladophora rupestris (Linnaeus) Kützing, 1843
- Common Green Branched Weed or Rock Cladophora

Cladophora sericea (Hudson) Kützing, 1843
- A Green Branched Weed

Cladophora species (1) - A Green Branched Weed
Cladophora species (2) - A Green Branched Weed
Cladophora species (3) - A Green Branched Weed

Rhizoclonium riparium (Roth) Harvey, 1849
- Rooting Green Thread Weed

Ulvophyceae (Class) > Ulotrichales (Order) > Gomontiaceae (Family)

Monostroma grevillei (Thuret) Wittrock, 1866
- A Green seaweed

Ulvophyceae (Class) > Ulotrichales (Order) > Ulotrichaceae (Family)

Spongomorpha aeruginosa (Linnaeus) Hoek, 1963
- Spongy Weed

Spongomorpha aeruginosa (Linnaeus) Hoek, 1963
Chlorochytrium inclusum sporophyte phase
- Spongy Weed

Spongomorpha arcta (Dillwyn) Kützing, 1849
- Green Tarantula Weed or Dillwyn's Spongy Weed

Ulothrix speciosa (Carmichael) Kützing, 1849
- A Green algae

Ulvophyceae (Class) > Ulvales (Order) > Kornmanniaceae (Family)

Blidingia minima (Nägeli ex Kützing) Kylin, 1947
- Lesser Grass Kelp

Tellamia contorta Batters, 1895 - A Green microalgae

Ulvophyceae (Class) > Ulvales (Order) > Ulvaceae (Family)

Percursaria percursa (C.Agardh) Rosenvinge, 1893 ?
- A Green algae

Ulva clathrata (Roth) C.Agardh, 1811 - Spiky Tendrils
Ulva compressa Linnaeus, 1753 - Thread or Tape Weed
Ulva flexuosa Wulfen, 1803 - Thread or Tape Weed
Ulva intestinalis Linnaeus, 1753 - Gut Weed
Ulva lactuca Linnaeus, 1753 - Sea Lettuce
Ulva linza Linnaeus, 1753 - Doubled Ribbon Weed
Ulva prolifera O.F.Müller, 1778 - Thread or Tape Weed
Ulva rigida C.Agardh, 1823 ? - A Green seaweed

Umbraulva dangeardii M.J.Wynne & G. Furnari formerly Umbraulva olivascens (P.J.L. Dangeard) G. Furnari, nom. inval. - A probable non-native green seaweed

Objects that look like Green Seaweed
Swan Droppings / Poo

Many thanks to Professor Michael Guiry for his help in identifying some of the seaweeds featured on this page.
Michael Guiry's Seaweed Website

Other people have also provided advice about the algae on this page and numerous reference books have been used.

These include -

Seaweeds of Britain and Ireland (Seasearch) by Francis Bunker, Christine Maggs, Juliet Brodie and Anne Bunker. Published by Wild Nature Press

Volumes of Seaweeds of the British Isles by the Natural History Museum

Seaweeds by W. Braune and M. D. Guiry

Green Seaweed and Green Algae Images UK Chlorophyta