This common brown seaweed, grows up to 2m long and has two distinct stages. It starts off as a tiny olive-green button attached to the rock, before long strap-like reproductive fronds grow rapidly between February and May.
How to identify
Button or mushroom like projections appear up to 2cm wide, from which long, thin, green-brown straps grow for up to 2m, branching into two as they go.
Distribution
All coasts of Britain and Ireland, except for south east England.
Did you know?
This species lives for 2-3 years and only reproduces once before dying!
