Fucus Rockweed
Scientific Name: Fucus distichus
Category: other
Brief Description
A common brown seaweed found attached to rocks in the intertidal zone, featuring olive-brown fronds with paired air bladders.
Characteristics
Flat, dichotomously branched fronds with midribs and swollen, often yellowish tips containing reproductive structures. Olive to dark brown color.
Habitat
Attached to rocks in the mid-to-high intertidal zone of rocky shores.
When to Find It
Perennial; visible year-round, with reproductive tips most prominent in spring and summer.
Conservation Status
N/A
Ecological Role
Provides vital habitat, moisture, and shelter for small invertebrates like snails and crabs during low tide.
Easily Confused With
Mazzaella (Iridescent Seaweed) which has broad purple/green blades but lacks midribs or air-filled tips.
Observation Tips
Look for it on exposed rocks during low tide. Be careful as it is extremely slippery when wet.
Interesting Facts
The swollen tips are filled with a gel that protects the plant from drying out when the tide is out; some species have air bladders to keep fronds buoyant while submerged.
User Notes
Washington state beach