s A Field Guide to the British Seaweeds - NMBAQC

Ascophyllum nodosum
Frond very long, branched and strap-like with
single large ovoid bladders present in
intervals along the length of the frond, which
may be between 1 and 5 cm long. If present
receptacles are found on stalks within
marginal notches. Fronds can grow up to
150cm long and may be found in great
abundance particularly on very sheltered
shores where they can cover vast areas of
the littoral area. Stunted forms also exist but
are generally found on more exposed
shores. Often greeny brown in colour
Ascophyllum often very
abundant on sheltered shores
Large air bladders at
intervals along the main
frond, presence of
Polysiphonia lanosa also a
characteristic of
Ascophyllum
Stunted form