Overview

Comprehensive Description

Description

 A large sturdy brown alga 0.3 -1 m in length (occasionally up to 2 m) rising from a strong, flattened cone shaped holdfast. The main stem is flattened and branches alternately to give a distinctly zigzag appearance. The stem bears a few, flattened ribbon-like 'leafy' fronds. The ends of some branches bear characteristic pod-shaped air bladders (about 0.5 cm wide by 1-4 cm long) that are divided by transverse septa into 10 or 12 compartments. The branches also bear reproductive bodies that appear similar to the bladders but lack the septa. Young plants are olive-green in colour while older specimens are dark brown and leathery. This species is perennial.
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Source: Marine Life Information Network

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Description

Thallus to 2 m long, compressed tough and leatherly, attached by strong holdfast. Branches distichous and regularly alternate. Air bladders, up to 5 cms long, are oblong and stalked towards the ends of the branches. The air bladders are divided by cross walls visible when sectioned longitudinally.
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Source: Encyclopedia of Marine Life of Britain and Ireland

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Distribution

Widespread around the British Isles. Europe: Portugal, Atlantic coasts of Spain and France, Netherlands, Baltic Sea, Norway and the Faroes.
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Source: Encyclopedia of Marine Life of Britain and Ireland

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Ecology

Habitat

Depth range based on 133 specimens in 1 taxon.
Water temperature and chemistry ranges based on 16 samples.

Environmental ranges
  Depth range (m): 0 - 17.8
  Temperature range (°C): 11.471 - 12.270
  Nitrate (umol/L): 4.573 - 7.121
  Salinity (PPS): 35.008 - 35.343
  Oxygen (ml/l): 6.069 - 6.346
  Phosphate (umol/l): 0.333 - 0.439
  Silicate (umol/l): 2.315 - 3.727

Graphical representation

Depth range (m): 0 - 17.8

Temperature range (°C): 11.471 - 12.270

Nitrate (umol/L): 4.573 - 7.121

Salinity (PPS): 35.008 - 35.343

Oxygen (ml/l): 6.069 - 6.346

Phosphate (umol/l): 0.333 - 0.439

Silicate (umol/l): 2.315 - 3.727
 
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 A distinctive and common rock pool seaweed from the middle to lower shore (may be found in upper eulittoral but only in rock pools). It may also form a zone in the sublittoral below the lower limit of Laminaria digitata. It often supports a range of invertebrate epifauna such as bryozoans, hydroids and ascidians and epiflora such as small red algae, Ulva sp. and other fucoids.
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Common. Low littoral rock pools and upper sub-littoral.
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Source: Encyclopedia of Marine Life of Britain and Ireland

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Associations

Plant / epiphyte
Amathia lendigera grows on Halidrys siliquosa
Other: major host/prey

Plant / associate
Synisoma acuminatum is associated with Halidrys siliquosa

Plant / epiphyte
loosely tufted colony of Walkeria uva grows on Halidrys siliquosa
Other: major host/prey

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