APHOTOMARINE
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 by David Fenwick.
Bangiaceae (Family)
Bangia
Bangia fuscopurpurea (Dillwyn) Lyngbye, 1819
- Velvet Thread Weed
Porphyra
Porphyra dioica J.Brodie & L.M.Irvine, 1997 - Black Laver
Porphyra linearis Greville, 1830
- Winter Laver
Porphyra purpurea (Roth) C.Agardh, 1824? - Purple Laver
Porphyra umbilicalis Kützing, 1843
- Tough Laver
Eurhodophytina (Subdivision) > Florideophyceae (Class) > Ahnfeltiophycidae (Subclass) > Ahnfeltiales (Order)
Ahnfeltiaceae (Family)
Ahnfeltia
Ahnfeltia plicata (Hudson) E.M.Fries, 1836
- Black Scour Weed
Eurhodophytina (Subdivision) > Florideophyceae (Class) > Corallinophycidae (Subclass) > Corallinales (Order)
Corallinaceae (Family) > Corallinoideae (Subfamily)
Corallina
Corallina caespitosa R.H.Walker, J.Brodie & L.M.Irvine, 2009 - Tufted Coral Weed
Corallina officinalis Linnaeus, 1758
- Common Coral Weed
Corallinaceae (Family) > Corallinoideae (Subfamily) > Corallineae (Tribe)
Corallinaceae (Family) > Corallinoideae (Subfamily) > Janieae (Tribe)
Jania
Jania rubens var. corniculata (Linnaeus) Yendo 1905
- Slender-beaded or Reddish Coral Weed
Jania rubens var. rubens (Linnaeus) J.V.Lamouroux, 1816
- Slender-beaded or Reddish Coral Weed
Jania squamata (Linnaeus) J.H.Kim, Guiry & H.-G.Choi, 2007 - Creeping Coral Weed
Hapalidiaceae (Family) > Choreonematoideae (Subfamily)
Choreonema
Choreonema thuretii (Bornet) F.Schmitz, 1889
- An algal parasite of Jania sp.
Eurhodophytina (Subdivision) > Florideophyceae (Class) > Nemaliophycidae (Subclass) > Acrochaetiales (Order)
Acrochaetiaceae (Family)
Rhodochorton
Rhodochorton purpureum (Lightfoot) Rosenvinge, 1900
- Purple Hair Weed or Purple Felt Weed
Rhodochorton purpureum (Lightfoot) Rosenvinge, 1900
- Purple Hair Weed or Purple Felt Weed (in sea cave)
Acrochaetioid algae, various images of
members of the acrochaetiaceae
Acrochaetioid algae, epiphytic on
a species of Cladophora
Acrochaetioid algae, epiphytic on Palmaria palmata
Acrochaetioid algae, epiphytic on a species of Porphyra
Acrochaetioid algae, epiphytic on
Zostera marina
Eurhodophytina (Subdivision) > Florideophyceae (Class) > Nemaliophycidae (Subclass) > Colaconematales (Order)
Colaconemataceae (Family)
Colaconema
Colaconema caespitosum (J.Agardh) Jackelman, Stegenga & J.J.Bolton, 1991 - A red algae
Colaconema infestans (M.A.Howe & Hoyt) Woelkerling, 1973
- A red algae
Eurhodophytina (Subdivision) > Florideophyceae (Class) > Nemaliophycidae (Subclass) > Nemaliales (Order)
Liagoraceae (Family)
Nemalion
Nemalion helminthoides (Velley) Batters, 1902
- Threadweed or Sea Noodles
Scinaiaceae (Family)
Scinaia
Scinaia furcellata (Turner) J.Agardh, 1851
- Southern Scinà's Weed
Scinaia interrupta (A.P.de Candolle) M.J.Wynne 1989
- Irregular Scinà's Weed
Eurhodophytina (Subdivision) > Florideophyceae (Class) > Rhodymeniophycidae (Subclass) > Bonnemaisoniales (Order)
Bonnemaisoniaceae (Family)
Asparagopsis
Asparagopsis armata Harvey, 1855 - Harpoon Weed (invasive non-native species)
Asparagopsis armata Harvey, 1855
- Falkenbergia-phase of Harpoon Weed (invasive non-native species)
Bonnemaisonia
Bonnemaisonia asparagoides (Woodward) C.Agardh, 1822
- A red seaweed
Bonnemaisonia hamifera Hariot, 1891 - Hooked Weed (invasive non-native species)
Bonnemaisonia hamifera Hariot, 1891
- Trailliella-phase of Hooked Weed (invasive non-native species)
Naccariaceae (Family)
Naccaria
Naccaria wiggii (Turner) Endlicher, 1836
- Naccari's Hairy Weed
Eurhodophytina (Subdivision) > Florideophyceae (Class) > Rhodymeniophycidae (Subclass) > Ceramiales (Order)
Callithamniaceae (Family) > Callithamnieae (Tribe)
Aglaothamnion
Aglaothamnion gallicum (Nägeli) Halos ex Ardré, 1970
- A Beautiful Bush Weed
Aglaothamnion hookeri (Dillwyn) Maggs & Hommersand, 1993
- A Beautiful Bush Weed
Aglaothamnion roseum (Roth) Maggs & L'Hardy-Halos, 1993 - A Beautiful Bush Weed
Aglaothamnion sepositum (Gunnerus) Maggs & Hommersand, 1993 - A Beautiful Bush Weed
Aglaothamnion tenuissimum (Bonnemaison) Feldmann-Mazoyer, 1941 - A Beautiful Bush Weed
Callithamnion
Callithamnion tetragonum (Withering) S.F.Gray, 1821
- A red seaweed
Callithamnion tetragonum var. brachiatum
- A distinct form of the above species although now included with it, separated here for convenience
Callithamnion tetricum (Dillwyn) S.F.Gray, 1821
- A red seaweed
Callithamniaceae (Family) > Crouanieae (Tribe)
Crouania
Crouania attenuata (C.Agardh) J.Agardh, 1842
- Small Banded Jelly Weed
Ceramiaceae (Family) > Ceramioideae (Subfamily) > Ceramieae (Tribe)
Ceramium
Ceramium ciliatum (J.Ellis) Ducluzeau, 1806
- A Banded Pincer Weed
Ceramium echionotum J.Agardh, 1844
- Simply Spined Banded Pincer Weed
Ceramium gaditanum (Clemente) Cremades, 1990
- A Banded Pincer Weed
Ceramium secundatum Lyngbye, 1819
- Sandy Banded Pincer Weed
Ceramium shuttleworthianum (Kützing) Rabenhorst, 1847
- Thornback Pincer Weed
Ceramium virgatum Roth, 1797
- A Banded Pincer Weed or Red Hornweed
Ceramiaceae (Family) > Ceramioideae (Subfamily) > Dohrnielleae (Tribe)
Antithamnionella
Antithamnionella ternifolia (J.D.Hooker & Harvey) Lyle, 1922
- A red seaweed (invasive non-native species)
Ceramiaceae (Family) > Ceramioideae (Subfamily) > Pterothamnieae (Tribe)
Pterothamnion
Pterothamnion crispum (Ducluzeau) Nägeli, 1862
- Whorled Feather Weed
Pterothamnion plumula (J.Ellis) Nägeli, 1855
- Bushy Feather Weed
Dasyaceae (Family) > Dasyoideae (Subfamily)
Dasya
Dasya ocellata (Grateloup) Harvey, 1833
- Little-eye Tree Weed
Dasya sessilis Yamada, 1928
- A red seaweed (likely a new non-native species for the UK
but this requires verification)
Dasyaceae (Family) > Heterosiphonioideae (Subfamily)
Heterosiphonia
Heterosiphonia plumosa (J.Ellis) Batters, 1902
- Siphoned Feather Weed
Delesseriaceae (Family) > Delesserioideae (Subfamily) > Apoglosseae (Tribe)
Apoglossum
Apoglossum ruscifolium (Turner) J.Agardh, 1898
- Veined Tongue Weed
Delesseriaceae (Family) > Delesserioideae (Subfamily) > Delesserieae (Tribe)
Membranoptera
Membranoptera alata (Hudson) Stackhouse, 1809
- Winged Weed
Delesseriaceae (Family) > Delesserioideae (Subfamily) > Hypoglosseae (Tribe)
Hypoglossum
Hypoglossum hypoglossoides (Stackhouse) F.S.Collins & Hervey, 1917 - Under Tongue Weed
Delesseriaceae (Family) > Nitophylloideae (Subfamily) > Nitophylleae (Tribe)
Nitophyllum
Nitophyllum punctatum (Stackhouse) Greville, 1830
- Spotted Scarf Weed
Delesseriaceae (Family) > Phycodryoideae (Subfamily) > Cryptopleureae (Tribe)
Cryptopleura
Cryptopleura ramosa (Hudson) L.Newton, 1931
- Branched Hidden Ribs
Gonimophyllum
Gonimophyllum buffhamii Batters, 1892
- A parasitic red algae
Delesseriaceae (Family) > Phycodryoideae (Subfamily) > Phycodryeae (Tribe)
Phycodrys
Phycodrys rubens (Linnaeus) Batters, 1902 - Sea Oak
Polyneura
Polyneura bonnemaisonii (C.Agardh) Maggs & Hommersand, 1993 - Crimson Veined Weed
Rhodomelaceae (Family)
Choreocolax
Choreocolax polysiphoniae Reinsch, 1875
- A red algae parasitic on Vertebrata lanosa
Rhodomela
Rhodomela confervoides (Hudson) P.C.Silva, 1952
- Straggly Bush Weed
Rhodomelaceae (Family) > Bostrychieae (Tribe)
Bostrychia
Bostrychia scorpioides (Hudson) Montagne, 1842
- Scorpion-tailed Saltmarsh Weed
Rhodomelaceae (Family) > Chondrieae (Tribe)
Chondria
Chondria coerulescens (J.Agardh) Falkenberg, 1901
- Iridescent Cartilage Weed
Chondria dasyphylla (Woodward) C.Agardh, 1817
- Diamond Cartilage Weed
Rhodomelaceae (Family) > Laurencieae (Tribe)
Laurencia
Laurencia obtusa (Hudson) J.V.Lamouroux, 1813
- Rounded Brittle Fern-weed
Osmundea
Osmundea hybrida (A.P.de Candolle) K.W.Nam, 1994
- False Pepper Dulse
Osmundea oederi (Gunnerus) G.Furnari, 2008
- Brittle Fern-weed
Osmundea osmunda (S.G.Gmelin) K.W.Nam & Maggs, 1994 ? - Royal Fern-weed
Osmundea pinnatifida (Hudson) Stackhouse, 1809
- Pepper Dulse
Osmundea truncata (Kützing) K.W.Nam & Maggs, 1994 ?
- A Fern-weed
Rhodomelaceae (Family) > Polysiphonieae (Tribe)
Polysiphonia
Polysiphonia atlantica Kapraun & J.N.Norris, 1982
- Atlantic Siphon Weed
Polysiphonia brodiei (Dillwyn) Sprengel, 1827
- Brodie's Siphon Weed
Polysiphonia denudata (Dillwyn) Greville ex Harvey, 1833
- Wide-branched Siphon Weed
Polysiphonia elongata (Hudson) Sprengel, 1827
- Elongate Siphon Weed
Vertebrata
Vertebrata byssoides (Goodenough & Woodward) Kuntze, 1891 - Brongniart's Thread Weed
Vertebrata fruticulosa (Wulfen) Kuntze, 1891 syn. Boergeseniella fruticulosa (Wulfen) Kylin, 1956
- Tufted Shrub Weed
Vertebrata fucoides (Hudson) Kuntze, 1891
- A Siphon Weed
Vertebrata lanosa (Linnaeus) T.A.Christensen, 1967
syn. Polysiphonia lanosa - Many Tubed Gable Weed
Vertebrata nigra (Hudson) Díaz-Tapia & Maggs, 2017
- Twisted Siphon Weed
Vertebrata thuyoides (Harvey) Kuntze, 1891 syn. Boergeseniella thuyoides - Tufted Conifer Weed
Rhodomelaceae (Family) > Pterosiphonieae (Tribe)
Pterosiphonia
Pterosiphonia complanata (Clemente) Falkenberg, 1897
- Flat Winged Weed
Symphyocladia
Symphyocladia parasitica (Hudson) Savoie & G.W.Saunders, 2016 syn. Pterosiphonia parasitica - Parasitic Winged Weed
Wrangeliaceae (Family) > Compsothamnieae (Tribe)
Compsothamnion
Compsothamnion gracillimum De Toni, 1903
- Most Graceful Elegant Small Bush Weed ?
Wrangeliaceae (Family) > Griffithsieae (Tribe)
Anotrichium
Anotrichium furcellatum (J.Agardh) Baldock, 1976
- Forked Twig Weed (probably non-native)
Griffithsia
Griffithsia corallinoides (Linnaeus) Trevisan, 1845
- Mrs Griffith's Coral Weed
Halurus
Halurus equisetifolius (Lightfoot) Kützing, 1843
- Sea Horsetail, Sea Tail or Sea Mare’s-tail
Halurus flosculosus (J.Ellis) Maggs & Hommersand, 1993
- Mrs. Griffiths's Little Flower
Wrangeliaceae (Family) > Monosporeae (Tribe)
Monosporus
Monosporus pedicellatus (Smith) Solier, 1845
- A red seaweed
Wrangeliaceae (Family) > Ptiloteae (Tribe)
Plumaria
Plumaria plumosa (Hudson) Kuntze, 1891
- Soft Feather Weed
Wrangeliaceae (Family) > Spermothamnieae (Tribe)
Spermothamnion
Spermothamnion repens (Dillwyn) Rosenvinge, 1924
- A red seaweed
Wrangeliaceae (Family) > Sphondylothamnieae (Tribe)
Sphondylothamnion
Sphondylothamnion multifidum (Hudson) Nägeli, 1862
- Whorled Bush Weed
Eurhodophytina (Subdivision) > Florideophyceae (Class) > Rhodymeniophycidae (Subclass) > Gelidiales (Order)
Gelidiaceae (Family)
Gelidium
Gelidium pulchellum (Turner) Kützing, 1868
- Beautiful Straggle Weed
Gelidium pusillum (Stackhouse) Le Jolis, 1863
- A Straggle Weed
Gelidium spinosum (S.G.Gmelin) P.C.Silva, 1996
- Spiny Straggle Weed
Pterocladiaceae (Family)
Pterocladiella
Pterocladiella capillacea (S.G.Gmelin) Santelices & Hommersand, 1997 syn. Pterocladia capillacea
- Branched Wing Weed
Eurhodophytina (Subdivision) > Florideophyceae (Class) > Rhodymeniophycidae (Subclass) > Gigartinales (Order)
Caulacanthaceae (Family)
Catenella
Catenella caespitosa (Withering) L.M.Irvine, 1976
- Creeping Chain Weed
Caulacanthus
Caulacanthus okamurae Yamada, 1933
- Pom-pom Weed (invasive non-native species)
Cystocloniaceae (Family)
Calliblepharis
Calliblepharis ciliata (Hudson) Kützing, 1843
- Beautiful Eyelash or Red Fringed Weed
Calliblepharis jubata (Goodenough & Woodward) Kützing, 1843
- False Eyelash Weed
Cystoclonium
Cystoclonium purpureum (Hudson) Batters, 1902
- Purple Claw Weed
Rhodophyllis
Rhodophyllis divaricata (Stackhouse) Papenfuss, 1950
- Leafy Rose Weed
Dumontiaceae (Family)
Dilsea
Dilsea carnosa (Schmidel) Kuntze, 1898
- Red Rags or False Dulse
Dumontia
Dumontia contorta (S.G.Gmelin) Ruprecht, 1850
- Dumont's Tubular Weed (syn. D. incrassata)
Pikea
Pikea californica Harvey, 1853 - Captain Pike's Golden Gate Weed (invasive non-native species)
Furcellariaceae (Family)
Furcellaria
Furcellaria lumbricalis (Hudson) J.V.Lamouroux, 1813
- Clawed Fork Weed or Black Carrageen
Gigartinaceae (Family)
Chondracanthus
Chondracanthus acicularis (Roth) Fredericq, 1993
- Creephorn
Chondrus
Chondrus crispus Stackhouse, 1797
- Carragheen or Irish Moss
Gigartina
Gigartina pistillata (S.G.Gmelin) Stackhouse, 1809
- Pestle Weed
Gloiosiphoniaceae (Family)
Gloiosiphonia
Gloiosiphonia capillaris (Hudson) Carmichael, 1833
- Sticky Tube Weed
Kallymeniaceae (Family)
Callocolax
Callocolax neglectus F.Schmitz ex Batters, 1895
- A red algal parasite of Metacallophyllis laciniata
Callophyllis laciniata see - Metacallophyllis laciniata
Kallymenia
Kallymenia reniformis (Turner) J.Agardh, 1842
- Beautiful Kidney Weed
Metacallophyllis
Metacallophyllis laciniata (Hudson) A. Vergés & L. Le Gall, 2017 syn. Callophyllis laciniata
- Beautiful Fan Weed
Phyllophoraceae (Family)
Gymnogongrus
Gymnogongrus crenulatus (Turner) J.Agardh, 1851
- Norwegian Fan Weed
Gymnogongrus griffithsiae (Turner) Martius, 1833
- Mrs Griffiths's Fan Weed
Mastocarpus
Mastocarpus stellatus (Stackhouse) Guiry, 1984
- False Irish Moss or Agar Weed
Phyllophora
Phyllophora pseudoceranoides (S.G.Gmelin) Newroth & A.R.A.Taylor, 1971 - Stalked Leaf Bearer
Schottera
Schottera nicaeensis (J.V. Lamouroux ex Duby)
Guiry & Hollenberg, 1975 - Shaded Weed
Stenogramma
Stenogramma interruptum (C.Agardh) Montagne, 1846
- Papery Fan Weed
Polyidaceae (Family)
Polyides
Polyides rotunda (Hudson) Gaillon, 1828
- Discoid Fork Weed or Goat Tang
Schmiziellaceae (Family)
Schmitziella
Schmitziella endophloea Bornet & Batters, 1892
- An endophytic algae of Cladophora pellucida
Solieriaceae (Family)
Sphaerococcaceae (Family)
Sphaerococcus
Sphaerococcus coronopifolius Stackhouse, 1797
- Berry Wart Cress
Eurhodophytina (Subdivision) > Florideophyceae (Class) > Rhodymeniophycidae (Subclass) > Gracilariales (Order)
Gracilariaceae (Family) > Gracilarioideae (Subfamily) > Gracilarieae (Tribe)
Gracilaria
Gracilaria gracilis (Stackhouse) M.Steentoft, L.M.Irvine & W.F.Farnham, 1995 - Slender Wart Weed
Gracilaria multipartita (Clemente) Harvey, 1846
- Cleaved Wart Weed
Gracilariaceae (Family) > Gracilarioideae (Subfamily) > Gracilariopsideae (Tribe)
Gracilariopsis
Gracilariopsis longissima (S.G.Gmelin) M.Steentoft, L.M.Irvine & W.F.Farnham, 1995 - Long Wart Weed (1)
Gracilariopsis longissima (S.G.Gmelin) M.Steentoft, L.M.Irvine & W.F.Farnham, 1995 ? - Long Wart Weed (2)
Pterocladiophilaceae (Family)
Gelidiocolax
Gelidiocolax margaritoides (M.T.Martin & M.A.Pocock)
K.-C.Fan & Papenfuss, 1959 - A red algae parasitic
on Gelidium
Holmsella
Holmsella pachyderma (Reinsch) Sturch, 1926
- A red algal parasite of Gracilaria and Gracilariopsis
Eurhodophytina (Subdivision) > Florideophyceae (Class) > Rhodymeniophycidae (Subclass) > Halymeniales (Order)
Halymeniaceae (Family)
Grateloupia
Grateloupia filicina (J.V.Lamouroux) C.Agardh, 1822
- Grateloup's Fern Weed (invasive non-native species)
Grateloupia turuturu Yamada, 1941
- Devil's Tongue Weed (invasive non-native species)
Eurhodophytina (Subdivision) > Florideophyceae (Class) > Rhodymeniophycidae (Subclass) > Nemastomatales (Order)
Schizymeniaceae (Family)
Schizymenia
Schizymenia dubyi (Chauvin ex Duby) J.Agardh, 1851
- Starry Liver Weed
Eurhodophytina (Subdivision) > Florideophyceae (Class) > Rhodymeniophycidae (Subclass) > Palmariales (Order)
Palmariaceae (Family)
Palmaria
Palmaria palmata (Linnaeus) Weber & Mohr, 1805
- Dulse, Dillisk or Crannach
Rhodophysemataceae (Family)
Rhodophysema
Rhodophysema georgei Batters, 1900
- An epiphyte of Eel-grass, Zostera marina
Rhodothamniellaceae (Family)
Rhodothamniella
Rhodothamniella floridula (Dillwyn) Feldmann, 1978
- Sand Binder
Eurhodophytina (Subdivision) > Florideophyceae (Class) > Rhodymeniophycidae (Subclass) > Plocamiales (Order)
Plocamiaceae (Family)
Plocamium
Plocamium cartilagineum (Linnaeus) P.S.Dixon, 1967
- Cocks Comb or Red Comb Weed
Plocamium nanum G.W.Saunders & K.V.Lehmkuhl, 2005 ?
- Wiry Cock's Comb
Eurhodophytina (Subdivision) > Florideophyceae (Class) > Rhodymeniophycidae (Subclass) > Rhodymeniales (Order)
Champiaceae (Family)
Champia
Champia parvula (C.Agardh) Harvey, 1853
- Little Fat Sausage Weed
Chylocladia
Chylocladia verticillata (Lightfoot) Bliding, 1928
- Juicy Whorl Weed
Gastroclonium
Gastroclonium ovatum (Hudson) Papenfuss, 1944
- Red Grape Weed or Egg-shaped Juice Branch Weed
Lomentariaceae (Family)
Lomentaria
Lomentaria articulata (Hudson) Lyngbye, 1819
- Bunny's Ears, Bunny-eared Bead-weed or Jointed Pod Weed
Lomentaria clavellosa (Lightfoot ex Turner) Gaillon, 1828
- Club Bead-weed or Feathery Tube Weed
Lomentaria orcadensis (Harvey) F.S.Collins, 1937
- Orkney Bean-weed or Orkney Weed
Eurhodophytina (Subdivision) > Florideophyceae (Class) > Rhodymeniophycidae (Subclass) > Rhodymeniales (Order)
Rhodymeniaceae (Family)
Rhodymenia
Rhodymenia pseudopalmata (J.V.Lamouroux)
P.C.Silva, 1952
- Rosy Fan Weed
Rhodymeniocolax
Rhodymeniocolax Setchell, 1923
- A red algae parasitic of Rhodymenia sp.
Metarhodophytina (Subdivision) > Compsopogonophyceae (Class) > Erythropeltidales (Order)
Erythrotrichiaceae (Family)
Porphyrostromium
Porphyrostromium boryanum (Montagne) P.C.Silva, 1996
Rhodellophytina (Subdivision) > Stylonematophyceae (Class) > Stylonematales (Order)
Stylonemataceae (Family)
Stylonema
Stylonema alsidii (Zanardini) K.M.Drew, 1956
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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
