Aquascope Facts
Little bladder wrack When all the eggs and sperm have been emitted, the recepticle yellows and dies, thereafter the branch upon which it sat also dies. Those plants that had many fertile shoots can be substantially "defoliated" when its reproductive period ends.

Bladder wrack without bladders

Bladder wrack that grows in areas that are exposed to powerful wave action can lack bladders. The plants have a tendency to be shorter, more slender and less branched. They resemble arctic wrack (Fucus evanescens = Fucus distichus = Fucus inflatus), which does not have a middle nerve on the uppermost branches and has a noticably long hermaphroditic recepticle.
    In the Baltic there is a form of bladder wrack that has a narrow lobe and a bushier appearance. Bladder wrack with this appearance is seldom longer than 1 dm, and they lie loose on the bottom and drift about in small piles.

Bo Johannesson
Bladder wrack without bladders

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Close to the water surface
Endures drought and cold
Home for many
Thread-like algae take over

Protect themselves with poison and mucus

Eggs and sperm at the top

Bladder wrack without bladders

Bladder wrack     More facts     Other names

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Bo Johannesson | Martin Larsvik | Lars-Ove Loo | Helena Samuelsson