Pelvetia canaliculata

This seaweed is dark greenish-brown in colour when dry and yellow when wet. It has no gas bladders, the fronds have no midribs, and they are curled along the length forming a channel. Height 15cm.

Found on the upper shore attached to rocks. Reproduces from August to September. It is very resiliant to desiccation, and can survive for up to eight days without water. A common and widespread species.

Photograph of Channelled Wrack (Pelvetia canaliculata) taken June 2012, Llandudno, Wales. © Pete Hillman 2012. Camera used Nikon Coolpix P500.