Bryopsis

Sea Fern or Feather Algae
Bryopsis corticulans

Habitat: Rocky shores and tidepools

Range: Canada to Baja California

Fun fact: Like its close relatives, Codium and Caulerpa, this siphonous green alga is actually one huge multinucleate cell. Like Caulerpa, Bryopsis produces chemicals which are distasteful to many herbivores.