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s A Field Guide to the British Seaweeds - NMBAQC

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Halidrys siliquosa<br />

Plant <strong>to</strong>ugh and cartilaginous with<br />

pod like air bladders divided<br />

internally by cross-walls. Exhibits<br />

regular alternate branching with a<br />

‘zig-zag’ appearance. Generally<br />

found within mid <strong>to</strong> deep rockpools<br />

in <strong>the</strong> mid <strong>to</strong> lower lit<strong>to</strong>ral zones<br />

Himanthalia elongata<br />

Plant a long <strong>to</strong>ugh,<br />

cartilaginous strap shaped<br />

frond, characterised by its<br />

large but<strong>to</strong>n shaped and<br />

slightly stalked attachment<br />

structure. Not highly branched<br />

but distinctly dicho<strong>to</strong>mous with<br />

branches growing up <strong>to</strong><br />

150cm long, and found in <strong>the</strong><br />

lower lit<strong>to</strong>ral on rock outcrops<br />

or large shelves

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