Fucus distichus

Rockweed

Authority: Linnaeus

Thallus of this very common and abundant intertidal species is yellow-brown to medium brown, with a discoidal holdfast, flattened, straplike blades with midribs, which repeatedly branch more or less equally (dichotomous branching), and distinctive air bladders (receptacles) at reproductive maturity. Individuals grow up to 50 cm (20 in) tall.

Habitat

This perennial can dominate high to low intertidal rock from estuarine to semi-exposed habitats. Rockweed is very tolerant of fresh water and freezing temperatures.