Description:
Thallus flat and leaf-like, to 300 mm long and 20-30 mm broad; fronds olive to yellow-brown, translucent, and more or less regularly dichotomously forked with a prominent midrib extending to the apices. Margins sometimes split to the midrib. Initially with an unpleasant smell shortly after collection, and degenerating quickly.
Habitat:
Large pools at low water and shallow sub tidal.
Distribution:
Widely distributed and locally abundant in summer. All around Ireland except for E coast, W Scotland, Wales, SW England, and S to Portugal and W Africa.
Key characteristics:
Midrib, strong smell.
