| Name | Notes |
|---|---|
| egg wrack | Ascophyllum nodosum (fucaceae) |
| Key criteria: | Absent from exposed coasts this is one of the most dominant and easily recognised of the intertidal perennial rock-dwelling brown seaweeds in the area. intertidal rock exposed |
| serrated wrack | Fucus serratus (fucaceae) |
| Key criteria: | A large easily recognised wrack that usually dominates the lower intertidal in pools and emersed on all but the most exposed and most sheltered shores. lower intertidal intertidal sheltered exposed pool |
| spiraled wrack | Fucus spiralis (fucaceae) |
| Key criteria: | A quite large wrack found on sheltered northern shores. sheltered |
| bladder wrack | Fucus vesiculosus (fucaceae) |
| Key criteria: | The commonest of the wracks. Its characteristic bladders are not developed in wave-exposed situations and these forms are sometimes overlooked or misidentified. Widespread. Rock. Intertidal. intertidal rock exposed |
| bladder wrack | Fucus vesiculosus ecad volubilis (fucaceae) |
| Key criteria: | The commonest of the wracks. Its characteristic bladders are not developed in wave-exposed situations and these forms are sometimes overlooked or misidentified. Widespread. Rock. Intertidal. intertidal rock exposed |
| thong weed | Himanthalia elongata (himanthaliaceae) |
| Key criteria: | With its button-like base and its long strap-like thalli this is probably the most distinctive of all the brown algae in the area. Widely distributed it is only unaccountably absent from the east and southeast coasts of England. ~ |
| channel wrack | Pelvetia canaliculata (fucaceae) |
| Key criteria: | A distinctive and common high-shore dweller widely distributed except for parts of the east and southeast coast of England which may be due to lack of suitable substrata. ~ |
| japweed | Sargassum muticum (sargassaceae) |
| Key criteria: | A large introduced species which can be locally abundant and dominant in intertidal pools extending into the shallow subtidal. Maximum growth occurs during spring and summer before dying back to a perennial base. First reported for the Isle of Wight in 1973 it has extended its distribution on the south coast of England and has more recently been reported for several locations in Ireland. intertidal shallow subtidal subtidal pool |
| moss wrack | Fucus cottonii (fucaceae) |
| Key criteria: | A miniature salt-marsh wrack largely confined to the west coasts of Ireland and Scotland. Forms a low turf-like covering in mud and in salt-marsh vegetation swards. mud marsh |
| no common name | Ascophyllum nodosum ecad mackayi (fucaceae) |
| Key criteria: | A morphologically reduced dichotomously branched tufted unattached form of A. nodosum that is almost exclusively confined to muddy or sandy intertidal shores of landlocked bays and estuaries on the west coasts of Scotland and Ireland. intertidal mud sand |
| no common name | Feldmannia simplex (fucaceae) |
| Key criteria: | Plants epiphytic forming small filamentous tufts on various hosts especially Codium. Not uncommon and quite widely distributed. epiphyte |
| horned wrack | Fucus ceranoides (fucaceae) |
| Key criteria: | A large distinctive wrack confined to estuaries places where fresh water runs over the shore and other brackish-water habitats. Irregular swellings on the thallus caused by exposure to freshwater may give it a very superficial resemblance to F. vesiculosus. brackish |
| two headed wrack | Fucus distichus (fucaceae) |
| Key criteria: | A northern wrack superficially resembling Pelvetia canaliculata found in the upper intertidal on very exposed and wave- battered shores. upper intertidal intertidal exposed |
| no common name | Fucus evanescens (fucaceae) |
| Key criteria: | A common high-shore dwelling wrack not always easy to identify with certainty unless fertile. ~ |
A Check-list and Atlas of the Seaweeds of Britain and Ireland. F. G. Hardy and M. D. Guiry. The British Phycological Society, 2003. ISBN 0 9527115 16 Seaweeds of Britain and Ireland. Bunker, Brodie, Maggs and Bunker. Seasearch 2012.